1 const char jbsockets_rcs[] = "$Id: jbsockets.c,v 1.49 2008/11/10 17:03:57 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 1.49 2008/11/10 17:03:57 fabiankeil
39 * Fix a gcc44 warning and remove a now-obsolete cast.
41 * Revision 1.48 2008/09/04 08:13:58 fabiankeil
42 * Prepare for critical sections on Windows by adding a
43 * layer of indirection before the pthread mutex functions.
45 * Revision 1.47 2008/03/26 18:07:07 fabiankeil
46 * Add hostname directive. Closes PR#1918189.
48 * Revision 1.46 2008/03/21 11:13:57 fabiankeil
49 * Only gather host information if it's actually needed.
50 * Also move the code out of accept_connection() so it's less likely
51 * to delay other incoming connections if the host is misconfigured.
53 * Revision 1.45 2007/09/30 16:59:22 fabiankeil
54 * Set the maximum listen() backlog to 128. Apparently SOMAXCONN is
55 * neither high enough, nor a hard limit on mingw32. Again for BR#1795281.
57 * Revision 1.44 2007/09/15 13:01:31 fabiankeil
58 * Increase listen() backlog to SOMAXCONN (or 128) to decrease
59 * chances of dropped connections under load. Problem reported
60 * and fix suggested by nobody in BR#1795281.
62 * Revision 1.43 2007/06/01 18:16:36 fabiankeil
63 * Use the same mutex for gethostbyname() and gethostbyaddr() to prevent
64 * deadlocks and crashes on OpenBSD and possibly other OS with neither
65 * gethostbyname_r() nor gethostaddr_r(). Closes BR#1729174.
66 * Thanks to Ralf Horstmann for report and solution.
68 * Revision 1.42 2007/04/01 17:37:07 fabiankeil
69 * - Add DNS retries for Solaris and other systems
70 * whose gethostbyname_r version takes five arguments.
71 * - Move maximum number of DNS retries into a macro.
73 * Revision 1.41 2006/11/13 19:05:51 fabiankeil
74 * Make pthread mutex locking more generic. Instead of
75 * checking for OSX and OpenBSD, check for FEATURE_PTHREAD
76 * and use mutex locking unless there is an _r function
77 * available. Better safe than sorry.
79 * Fixes "./configure --disable-pthread" and should result
80 * in less threading-related problems on pthread-using platforms,
81 * but it still doesn't fix BR#1122404.
83 * Revision 1.40 2006/09/02 15:36:42 fabiankeil
84 * Follow the OpenBSD port's lead and protect the resolve
85 * functions on OpenBSD as well.
87 * Revision 1.39 2006/08/03 02:46:41 david__schmidt
88 * Incorporate Fabian Keil's patch work:
\rhttp://www.fabiankeil.de/sourcecode/privoxy/
90 * Revision 1.38 2006/07/18 14:48:46 david__schmidt
91 * Reorganizing the repository: swapping out what was HEAD (the old 3.1 branch)
92 * with what was really the latest development (the v_3_0_branch branch)
94 * Revision 1.35.2.8 2006/01/21 16:16:08 david__schmidt
95 * Thanks to Edward Carrel for his patch to modernize OSX's
\rpthreads support. See bug #1409623.
97 * Revision 1.35.2.7 2005/05/07 21:50:55 david__schmidt
98 * A few memory leaks plugged (mostly on error paths)
100 * Revision 1.35.2.6 2003/12/17 16:34:40 oes
103 * Revision 1.35.2.5 2003/04/29 11:32:54 oes
104 * Don't rely on h_addr being non-NULL after gethostbyname.
105 * Works around an oddness in Max OSX and closes bug #724796
107 * Revision 1.35.2.4 2003/04/04 12:40:20 oes
108 * Made sure the errno set by bind, not close[socket] is used in
109 * bind_port. Probably fixes bugs #713777, #705562.
111 * Revision 1.35.2.3 2003/03/07 03:41:04 david__schmidt
112 * 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.
114 * Revision 1.35.2.2 2002/11/20 14:37:24 oes
115 * Fixed Win32 error logging in bind_port.
116 * Thanks to Oliver Stoeneberg for the hint.
118 * Revision 1.35.2.1 2002/05/26 23:41:27 joergs
119 * AmigaOS: Fixed wrong type of len in write_socket()
121 * Revision 1.35 2002/04/26 15:50:04 joergs
122 * AmigaOS: No socklen_t, added AMIGA to the systems using int instead.
124 * Revision 1.34 2002/04/08 20:31:41 swa
127 * Revision 1.33 2002/04/03 16:02:18 gliptak
128 * Correcting compile warning with older gcc
130 * Revision 1.32 2002/03/31 17:18:59 jongfoster
131 * Win32 only: Enabling STRICT to fix a VC++ compile warning.
133 * Revision 1.31 2002/03/29 03:33:13 david__schmidt
134 * Fix Mac OSX compiler warnings
136 * Revision 1.30 2002/03/27 14:32:43 david__schmidt
137 * More compiler warning message maintenance
139 * Revision 1.29 2002/03/26 22:29:54 swa
140 * we have a new homepage!
142 * Revision 1.28 2002/03/24 13:25:43 swa
143 * name change related issues
145 * Revision 1.27 2002/03/13 00:27:05 jongfoster
148 * Revision 1.26 2002/03/11 22:07:02 david__schmidt
149 * OS/2 port maintenance:
150 * - Fixed EMX build - it had decayed a little
151 * - Fixed inexplicable crash during FD_ZERO - must be due to a bad macro.
152 * substituted a memset for now.
154 * Revision 1.25 2002/03/09 20:03:52 jongfoster
155 * - Making various functions return int rather than size_t.
156 * (Undoing a recent change). Since size_t is unsigned on
157 * Windows, functions like read_socket that return -1 on
158 * error cannot return a size_t.
160 * THIS WAS A MAJOR BUG - it caused frequent, unpredictable
161 * crashes, and also frequently caused JB to jump to 100%
162 * CPU and stay there. (Because it thought it had just
163 * read ((unsigned)-1) == 4Gb of data...)
165 * - The signature of write_socket has changed, it now simply
166 * returns success=0/failure=nonzero.
168 * - Trying to get rid of a few warnings --with-debug on
169 * Windows, I've introduced a new type "jb_socket". This is
170 * used for the socket file descriptors. On Windows, this
171 * is SOCKET (a typedef for unsigned). Everywhere else, it's
172 * an int. The error value can't be -1 any more, so it's
173 * now JB_INVALID_SOCKET (which is -1 on UNIX, and in
174 * Windows it maps to the #define INVALID_SOCKET.)
176 * - The signature of bind_port has changed.
178 * Revision 1.24 2002/03/07 03:51:36 oes
179 * - Improved handling of failed DNS lookups
180 * - Fixed compiler warnings etc
182 * Revision 1.23 2002/03/05 00:36:01 jongfoster
183 * Fixing bug 514988 - unable to restart Junkbuster
185 * Revision 1.22 2002/03/04 02:08:02 david__schmidt
186 * Enable web editing of actions file on OS/2 (it had been broken all this time!)
188 * Revision 1.21 2002/01/09 14:32:33 oes
189 * Added support for gethostbyname_r and gethostbyaddr_r.
191 * Revision 1.20 2001/11/16 00:48:48 jongfoster
192 * Enabling duplicate-socket detection for all platforms, not
195 * Revision 1.19 2001/10/25 03:40:47 david__schmidt
196 * Change in porting tactics: OS/2's EMX porting layer doesn't allow multiple
197 * threads to call select() simultaneously. So, it's time to do a real, live,
198 * native OS/2 port. See defines for __EMX__ (the porting layer) vs. __OS2__
199 * (native). Both versions will work, but using __OS2__ offers multi-threading.
201 * Revision 1.18 2001/09/21 23:02:02 david__schmidt
202 * Cleaning up 2 compiler warnings on OS/2.
204 * Revision 1.17 2001/09/13 20:11:46 jongfoster
205 * Fixing 2 compiler warnings under Win32
207 * Revision 1.16 2001/07/30 22:08:36 jongfoster
208 * Tidying up #defines:
209 * - All feature #defines are now of the form FEATURE_xxx
210 * - Permanently turned off WIN_GUI_EDIT
211 * - Permanently turned on WEBDAV and SPLIT_PROXY_ARGS
213 * Revision 1.15 2001/07/29 17:40:43 jongfoster
214 * Fixed compiler warning by adding a cast
216 * Revision 1.14 2001/07/18 13:47:59 oes
217 * Eliminated dirty hack for getsockbyname()
219 * Revision 1.13 2001/07/15 13:56:57 jongfoster
220 * Removing unused local variable.
222 * Revision 1.12 2001/07/01 17:04:11 oes
223 * Bugfix: accept_connection no longer uses the obsolete hstrerror() function
225 * Revision 1.11 2001/06/29 21:45:41 oes
226 * Indentation, CRLF->LF, Tab-> Space
228 * Revision 1.10 2001/06/29 13:29:15 oes
229 * - Added remote (server) host IP to csp->http->host_ip_addr_str
230 * - Added detection of local socket IP and fqdn
231 * - Removed logentry from cancelled commit
233 * Revision 1.9 2001/06/07 23:06:09 jongfoster
234 * The host parameter to connect_to() is now const.
236 * Revision 1.8 2001/06/03 19:12:07 oes
239 * Revision 1.7 2001/05/28 16:14:00 jongfoster
240 * Fixing bug in LOG_LEVEL_LOG
242 * Revision 1.6 2001/05/26 17:28:32 jongfoster
243 * Fixed LOG_LEVEL_LOG
245 * Revision 1.5 2001/05/26 15:26:15 jongfoster
246 * ACL feature now provides more security by immediately dropping
247 * connections from untrusted hosts.
249 * Revision 1.4 2001/05/26 00:37:42 jongfoster
250 * Cosmetic indentation correction.
252 * Revision 1.3 2001/05/25 21:57:54 jongfoster
253 * Now gives a warning under Windows if you try to bind
254 * it to a port that's already in use.
256 * Revision 1.2 2001/05/17 23:01:01 oes
257 * - Cleaned CRLF's from the sources and related files
259 * Revision 1.1.1.1 2001/05/15 13:58:54 oes
260 * Initial import of version 2.9.3 source tree
263 *********************************************************************/
273 #include <sys/types.h>
281 #include <sys/timeb.h>
289 #include <sys/time.h>
290 #include <netinet/in.h>
291 #include <sys/ioctl.h>
293 #include <sys/socket.h>
296 #include <netinet/tcp.h>
298 #include <arpa/inet.h>
304 #if defined(__EMX__) || defined (__OS2__)
305 #include <sys/select.h> /* OS/2/EMX needs a little help with select */
315 #ifdef FEATURE_PTHREAD
317 /* jcc.h is for mutex semaphores only */
318 #endif /* def FEATURE_PTHREAD */
320 #include "jbsockets.h"
324 const char jbsockets_h_rcs[] = JBSOCKETS_H_VERSION;
327 * Maximum number of gethostbyname(_r) retries in case of
328 * soft errors (TRY_AGAIN).
329 * XXX: Does it make sense to make this a config option?
331 #define MAX_DNS_RETRIES 10
333 #define MAX_LISTEN_BACKLOG 128
336 /*********************************************************************
338 * Function : connect_to
340 * Description : Open a socket and connect to it. Will check
341 * that this is allowed according to ACL.
344 * 1 : host = hostname to connect to
345 * 2 : portnum = port to connent on (XXX: should be unsigned)
346 * 3 : csp = Current client state (buffers, headers, etc...)
347 * Not modified, only used for source IP and ACL.
349 * Returns : JB_INVALID_SOCKET => failure, else it is the socket
352 *********************************************************************/
353 jb_socket connect_to(const char *host, int portnum, struct client_state *csp)
355 struct sockaddr_in inaddr;
359 struct timeval tv[1];
360 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA)
362 #endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) */
365 struct access_control_addr dst[1];
366 #endif /* def FEATURE_ACL */
368 memset((char *)&inaddr, 0, sizeof inaddr);
370 if ((addr = resolve_hostname_to_ip(host)) == INADDR_NONE)
372 csp->http->host_ip_addr_str = strdup("unknown");
373 return(JB_INVALID_SOCKET);
377 dst->addr = ntohl(addr);
380 if (block_acl(dst, csp))
387 return(JB_INVALID_SOCKET);
389 #endif /* def FEATURE_ACL */
391 inaddr.sin_addr.s_addr = addr;
392 inaddr.sin_family = AF_INET;
393 csp->http->host_ip_addr_str = strdup(inet_ntoa(inaddr.sin_addr));
396 if (sizeof(inaddr.sin_port) == sizeof(short))
397 #endif /* ndef _WIN32 */
399 inaddr.sin_port = htons((unsigned short) portnum);
404 inaddr.sin_port = htonl((unsigned long)portnum);
406 #endif /* ndef _WIN32 */
409 if ((fd = socket(inaddr.sin_family, SOCK_STREAM, 0)) == JB_INVALID_SOCKET)
411 if ((fd = socket(inaddr.sin_family, SOCK_STREAM, 0)) < 0)
414 return(JB_INVALID_SOCKET);
418 { /* turn off TCP coalescence */
420 setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, (char *) &mi, sizeof (int));
422 #endif /* def TCP_NODELAY */
424 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
425 if ((flags = fcntl(fd, F_GETFL, 0)) != -1)
428 fcntl(fd, F_SETFL, flags);
430 #endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__) */
432 while (connect(fd, (struct sockaddr *) & inaddr, sizeof inaddr) == JB_INVALID_SOCKET)
435 if (errno == WSAEINPROGRESS)
437 if (sock_errno() == EINPROGRESS)
438 #else /* ifndef _WIN32 */
439 if (errno == EINPROGRESS)
440 #endif /* ndef _WIN32 || __OS2__ */
446 if (sock_errno() != EINTR)
452 return(JB_INVALID_SOCKET);
456 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
460 fcntl(fd, F_SETFL, flags);
462 #endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__) */
464 /* wait for connection to complete */
471 /* MS Windows uses int, not SOCKET, for the 1st arg of select(). Wierd! */
472 if (select((int)fd + 1, NULL, &wfds, NULL, tv) <= 0)
475 return(JB_INVALID_SOCKET);
482 /*********************************************************************
484 * Function : write_socket
486 * Description : Write the contents of buf (for n bytes) to socket fd.
489 * 1 : fd = file descriptor (aka. handle) of socket to write to.
490 * 2 : buf = pointer to data to be written.
491 * 3 : len = length of data to be written to the socket "fd".
493 * Returns : 0 on success (entire buffer sent).
496 *********************************************************************/
498 int write_socket(jb_socket fd, const char *buf, ssize_t len)
500 int write_socket(jb_socket fd, const char *buf, size_t len)
508 if (len < 0) /* constant condition - size_t isn't ever negative */
513 log_error(LOG_LEVEL_LOG, "%N", len, buf);
516 return (send(fd, buf, (int)len, 0) != (int)len);
517 #elif defined(__BEOS__) || defined(AMIGA)
518 return (send(fd, buf, len, 0) != len);
519 #elif defined(__OS2__)
521 * Break the data up into SOCKET_SEND_MAX chunks for sending...
522 * OS/2 seemed to complain when the chunks were too large.
524 #define SOCKET_SEND_MAX 65000
526 int write_len = 0, send_len, send_rc = 0, i = 0;
527 while ((i < len) && (send_rc != -1))
529 if ((i + SOCKET_SEND_MAX) > len)
532 send_len = SOCKET_SEND_MAX;
533 send_rc = send(fd,(char*)buf + i, send_len, 0);
541 return (write(fd, buf, len) != len);
547 /*********************************************************************
549 * Function : read_socket
551 * Description : Read from a TCP/IP socket in a platform independent way.
554 * 1 : fd = file descriptor of the socket to read
555 * 2 : buf = pointer to buffer where data will be written
556 * Must be >= len bytes long.
557 * 3 : len = maximum number of bytes to read
559 * Returns : On success, the number of bytes read is returned (zero
560 * indicates end of file), and the file position is advanced
561 * by this number. It is not an error if this number is
562 * smaller than the number of bytes requested; this may hap-
563 * pen for example because fewer bytes are actually available
564 * right now (maybe because we were close to end-of-file, or
565 * because we are reading from a pipe, or from a terminal,
566 * or because read() was interrupted by a signal). On error,
567 * -1 is returned, and errno is set appropriately. In this
568 * case it is left unspecified whether the file position (if
571 *********************************************************************/
572 int read_socket(jb_socket fd, char *buf, int len)
580 return(recv(fd, buf, len, 0));
581 #elif defined(__BEOS__) || defined(AMIGA) || defined(__OS2__)
582 return(recv(fd, buf, (size_t)len, 0));
584 return(read(fd, buf, (size_t)len));
589 /*********************************************************************
591 * Function : data_is_available
593 * Description : Waits for data to arrive on a socket.
596 * 1 : fd = file descriptor of the socket to read
597 * 2 : seconds_to_wait = number of seconds after which we give up.
599 * Returns : TRUE if data arrived in time,
602 *********************************************************************/
603 int data_is_available(jb_socket fd, int seconds_to_wait)
606 struct timeval timeout;
609 memset(&timeout, 0, sizeof(timeout));
610 timeout.tv_sec = seconds_to_wait;
613 /* Copy and pasted from jcc.c ... */
614 memset(&rfds, 0, sizeof(fd_set));
620 n = select(fd+1, &rfds, NULL, NULL, &timeout);
623 * XXX: Do we care about the different error conditions?
629 /*********************************************************************
631 * Function : close_socket
633 * Description : Closes a TCP/IP socket
636 * 1 : fd = file descriptor of socket to be closed
640 *********************************************************************/
641 void close_socket(jb_socket fd)
643 #if defined(_WIN32) || defined(__BEOS__)
647 #elif defined(__OS2__)
656 /*********************************************************************
658 * Function : bind_port
660 * Description : Call socket, set socket options, and listen.
661 * Called by listen_loop to "boot up" our proxy address.
664 * 1 : hostnam = TCP/IP address to bind/listen to
665 * 2 : portnum = port to listen on
666 * 3 : pfd = pointer used to return file descriptor.
668 * Returns : if success, returns 0 and sets *pfd.
669 * if failure, returns -3 if address is in use,
670 * -2 if address unresolvable,
672 *********************************************************************/
673 int bind_port(const char *hostnam, int portnum, jb_socket *pfd)
675 struct sockaddr_in inaddr;
679 #endif /* ndef _WIN32 */
681 *pfd = JB_INVALID_SOCKET;
683 memset((char *)&inaddr, '\0', sizeof inaddr);
685 inaddr.sin_family = AF_INET;
686 inaddr.sin_addr.s_addr = resolve_hostname_to_ip(hostnam);
688 if (inaddr.sin_addr.s_addr == INADDR_NONE)
694 if (sizeof(inaddr.sin_port) == sizeof(short))
695 #endif /* ndef _WIN32 */
697 inaddr.sin_port = htons((unsigned short) portnum);
702 inaddr.sin_port = htonl((unsigned long) portnum);
704 #endif /* ndef _WIN32 */
706 fd = socket(AF_INET, SOCK_STREAM, 0);
709 if (fd == JB_INVALID_SOCKET)
719 * This is not needed for Win32 - in fact, it stops
720 * duplicate instances of Privoxy from being caught.
722 * On UNIX, we assume the user is sensible enough not
723 * to start Privoxy multiple times on the same IP.
724 * Without this, stopping and restarting Privoxy
725 * from a script fails.
726 * Note: SO_REUSEADDR is meant to only take over
727 * sockets which are *not* in listen state in Linux,
728 * e.g. sockets in TIME_WAIT. YMMV.
730 setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char *)&one, sizeof(one));
731 #endif /* ndef _WIN32 */
733 if (bind(fd, (struct sockaddr *)&inaddr, sizeof(inaddr)) < 0)
736 errno = WSAGetLastError();
737 if (errno == WSAEADDRINUSE)
739 if (errno == EADDRINUSE)
752 while (listen(fd, MAX_LISTEN_BACKLOG) == -1)
766 /*********************************************************************
768 * Function : get_host_information
770 * Description : Determines the IP address the client used to
771 * reach us and the hostname associated with it.
773 * XXX: Most of the code has been copy and pasted
774 * from accept_connection() and not all of the
775 * ifdefs paths have been tested afterwards.
778 * 1 : afd = File descriptor returned from accept().
779 * 2 : ip_address = Pointer to return the pointer to
780 * the ip address string.
781 * 3 : hostname = Pointer to return the pointer to
782 * the hostname or NULL if the caller
783 * isn't interested in it.
787 *********************************************************************/
788 void get_host_information(jb_socket afd, char **ip_address, char **hostname)
790 struct sockaddr_in server;
791 struct hostent *host = NULL;
792 #if defined(_WIN32) || defined(__OS2__) || defined(__APPLE_CC__) || defined(AMIGA)
793 /* according to accept_connection() this fixes a warning. */
798 #if defined(HAVE_GETHOSTBYADDR_R_8_ARGS) || defined(HAVE_GETHOSTBYADDR_R_7_ARGS) || defined(HAVE_GETHOSTBYADDR_R_5_ARGS)
799 struct hostent result;
800 #if defined(HAVE_GETHOSTBYADDR_R_5_ARGS)
801 struct hostent_data hdata;
803 char hbuf[HOSTENT_BUFFER_SIZE];
805 #endif /* def HAVE_GETHOSTBYADDR_R_5_ARGS */
806 #endif /* def HAVE_GETHOSTBYADDR_R_(8|7|5)_ARGS */
807 s_length = sizeof(server);
809 if (NULL != hostname)
815 if (!getsockname(afd, (struct sockaddr *) &server, &s_length))
817 *ip_address = strdup(inet_ntoa(server.sin_addr));
819 if (NULL == hostname)
822 * We're done here, the caller isn't
823 * interested in knowing the hostname.
827 #if defined(HAVE_GETHOSTBYADDR_R_8_ARGS)
828 gethostbyaddr_r((const char *)&server.sin_addr,
829 sizeof(server.sin_addr), AF_INET,
830 &result, hbuf, HOSTENT_BUFFER_SIZE,
832 #elif defined(HAVE_GETHOSTBYADDR_R_7_ARGS)
833 host = gethostbyaddr_r((const char *)&server.sin_addr,
834 sizeof(server.sin_addr), AF_INET,
835 &result, hbuf, HOSTENT_BUFFER_SIZE, &thd_err);
836 #elif defined(HAVE_GETHOSTBYADDR_R_5_ARGS)
837 if (0 == gethostbyaddr_r((const char *)&server.sin_addr,
838 sizeof(server.sin_addr), AF_INET,
847 #elif FEATURE_PTHREAD
848 privoxy_mutex_lock(&resolver_mutex);
849 host = gethostbyaddr((const char *)&server.sin_addr,
850 sizeof(server.sin_addr), AF_INET);
851 privoxy_mutex_unlock(&resolver_mutex);
853 host = gethostbyaddr((const char *)&server.sin_addr,
854 sizeof(server.sin_addr), AF_INET);
858 log_error(LOG_LEVEL_ERROR, "Unable to get my own hostname: %E\n");
862 *hostname = strdup(host->h_name);
870 /*********************************************************************
872 * Function : accept_connection
874 * Description : Accepts a connection on a socket. Socket must have
875 * been created using bind_port().
878 * 1 : csp = Client state, cfd, ip_addr_str, and
879 * ip_addr_long will be set by this routine.
880 * 2 : fd = file descriptor returned from bind_port
882 * Returns : when a connection is accepted, it returns 1 (TRUE).
883 * On an error it returns 0 (FALSE).
885 *********************************************************************/
886 int accept_connection(struct client_state * csp, jb_socket fd)
888 struct sockaddr_in client;
890 #if defined(_WIN32) || defined(__OS2__) || defined(__APPLE_CC__) || defined(AMIGA)
891 /* Wierdness - fix a warning. */
897 c_length = sizeof(client);
900 afd = accept (fd, (struct sockaddr *) &client, &c_length);
901 if (afd == JB_INVALID_SOCKET)
908 afd = accept (fd, (struct sockaddr *) &client, &c_length);
909 } while (afd < 1 && errno == EINTR);
917 csp->ip_addr_str = strdup(inet_ntoa(client.sin_addr));
918 csp->ip_addr_long = ntohl(client.sin_addr.s_addr);
925 /*********************************************************************
927 * Function : resolve_hostname_to_ip
929 * Description : Resolve a hostname to an internet tcp/ip address.
930 * NULL or an empty string resolve to INADDR_ANY.
933 * 1 : host = hostname to resolve
935 * Returns : INADDR_NONE => failure, INADDR_ANY or tcp/ip address if succesful.
937 *********************************************************************/
938 unsigned long resolve_hostname_to_ip(const char *host)
940 struct sockaddr_in inaddr;
941 struct hostent *hostp;
942 unsigned int dns_retries = 0;
943 #if defined(HAVE_GETHOSTBYNAME_R_6_ARGS) || defined(HAVE_GETHOSTBYNAME_R_5_ARGS) || defined(HAVE_GETHOSTBYNAME_R_3_ARGS)
944 struct hostent result;
945 #if defined(HAVE_GETHOSTBYNAME_R_6_ARGS) || defined(HAVE_GETHOSTBYNAME_R_5_ARGS)
946 char hbuf[HOSTENT_BUFFER_SIZE];
948 #else /* defined(HAVE_GETHOSTBYNAME_R_3_ARGS) */
949 struct hostent_data hdata;
950 #endif /* def HAVE_GETHOSTBYNAME_R_(6|5)_ARGS */
951 #endif /* def HAVE_GETHOSTBYNAME_R_(6|5|3)_ARGS */
953 if ((host == NULL) || (*host == '\0'))
958 memset((char *) &inaddr, 0, sizeof inaddr);
960 if ((inaddr.sin_addr.s_addr = inet_addr(host)) == -1)
962 #if defined(HAVE_GETHOSTBYNAME_R_6_ARGS)
963 while (gethostbyname_r(host, &result, hbuf,
964 HOSTENT_BUFFER_SIZE, &hostp, &thd_err)
965 && (thd_err == TRY_AGAIN) && (dns_retries++ < MAX_DNS_RETRIES))
967 log_error(LOG_LEVEL_ERROR,
968 "Timeout #%u while trying to resolve %s. Trying again.",
971 #elif defined(HAVE_GETHOSTBYNAME_R_5_ARGS)
972 while (NULL == (hostp = gethostbyname_r(host, &result,
973 hbuf, HOSTENT_BUFFER_SIZE, &thd_err))
974 && (thd_err == TRY_AGAIN) && (dns_retries++ < MAX_DNS_RETRIES))
976 log_error(LOG_LEVEL_ERROR,
977 "Timeout #%u while trying to resolve %s. Trying again.",
980 #elif defined(HAVE_GETHOSTBYNAME_R_3_ARGS)
982 * XXX: Doesn't retry in case of soft errors.
983 * Does this gethostbyname_r version set h_errno?
985 if (0 == gethostbyname_r(host, &result, &hdata))
993 #elif FEATURE_PTHREAD
994 privoxy_mutex_lock(&resolver_mutex);
995 while (NULL == (hostp = gethostbyname(host))
996 && (h_errno == TRY_AGAIN) && (dns_retries++ < MAX_DNS_RETRIES))
998 log_error(LOG_LEVEL_ERROR,
999 "Timeout #%u while trying to resolve %s. Trying again.",
1002 privoxy_mutex_unlock(&resolver_mutex);
1004 while (NULL == (hostp = gethostbyname(host))
1005 && (h_errno == TRY_AGAIN) && (dns_retries++ < MAX_DNS_RETRIES))
1007 log_error(LOG_LEVEL_ERROR,
1008 "Timeout #%u while trying to resolve %s. Trying again.",
1011 #endif /* def HAVE_GETHOSTBYNAME_R_(6|5|3)_ARGS */
1013 * On Mac OSX, if a domain exists but doesn't have a type A
1014 * record associated with it, the h_addr member of the struct
1015 * hostent returned by gethostbyname is NULL, even if h_length
1016 * is 4. Therefore the second test below.
1018 if (hostp == NULL || hostp->h_addr == NULL)
1021 log_error(LOG_LEVEL_ERROR, "could not resolve hostname %s", host);
1022 return(INADDR_NONE);
1024 if (hostp->h_addrtype != AF_INET)
1027 errno = WSAEPROTOTYPE;
1031 log_error(LOG_LEVEL_ERROR, "hostname %s resolves to unknown address type.", host);
1032 return(INADDR_NONE);
1035 (char *) &inaddr.sin_addr,
1036 (char *) hostp->h_addr,
1037 sizeof(inaddr.sin_addr)
1040 return(inaddr.sin_addr.s_addr);