1 const char jbsockets_rcs[] = "$Id: jbsockets.c,v 1.48 2008/09/04 08:13:58 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 1.48 2008/09/04 08:13:58 fabiankeil
39 * Prepare for critical sections on Windows by adding a
40 * layer of indirection before the pthread mutex functions.
42 * Revision 1.47 2008/03/26 18:07:07 fabiankeil
43 * Add hostname directive. Closes PR#1918189.
45 * Revision 1.46 2008/03/21 11:13:57 fabiankeil
46 * Only gather host information if it's actually needed.
47 * Also move the code out of accept_connection() so it's less likely
48 * to delay other incoming connections if the host is misconfigured.
50 * Revision 1.45 2007/09/30 16:59:22 fabiankeil
51 * Set the maximum listen() backlog to 128. Apparently SOMAXCONN is
52 * neither high enough, nor a hard limit on mingw32. Again for BR#1795281.
54 * Revision 1.44 2007/09/15 13:01:31 fabiankeil
55 * Increase listen() backlog to SOMAXCONN (or 128) to decrease
56 * chances of dropped connections under load. Problem reported
57 * and fix suggested by nobody in BR#1795281.
59 * Revision 1.43 2007/06/01 18:16:36 fabiankeil
60 * Use the same mutex for gethostbyname() and gethostbyaddr() to prevent
61 * deadlocks and crashes on OpenBSD and possibly other OS with neither
62 * gethostbyname_r() nor gethostaddr_r(). Closes BR#1729174.
63 * Thanks to Ralf Horstmann for report and solution.
65 * Revision 1.42 2007/04/01 17:37:07 fabiankeil
66 * - Add DNS retries for Solaris and other systems
67 * whose gethostbyname_r version takes five arguments.
68 * - Move maximum number of DNS retries into a macro.
70 * Revision 1.41 2006/11/13 19:05:51 fabiankeil
71 * Make pthread mutex locking more generic. Instead of
72 * checking for OSX and OpenBSD, check for FEATURE_PTHREAD
73 * and use mutex locking unless there is an _r function
74 * available. Better safe than sorry.
76 * Fixes "./configure --disable-pthread" and should result
77 * in less threading-related problems on pthread-using platforms,
78 * but it still doesn't fix BR#1122404.
80 * Revision 1.40 2006/09/02 15:36:42 fabiankeil
81 * Follow the OpenBSD port's lead and protect the resolve
82 * functions on OpenBSD as well.
84 * Revision 1.39 2006/08/03 02:46:41 david__schmidt
85 * Incorporate Fabian Keil's patch work:
\rhttp://www.fabiankeil.de/sourcecode/privoxy/
87 * Revision 1.38 2006/07/18 14:48:46 david__schmidt
88 * Reorganizing the repository: swapping out what was HEAD (the old 3.1 branch)
89 * with what was really the latest development (the v_3_0_branch branch)
91 * Revision 1.35.2.8 2006/01/21 16:16:08 david__schmidt
92 * Thanks to Edward Carrel for his patch to modernize OSX's
\rpthreads support. See bug #1409623.
94 * Revision 1.35.2.7 2005/05/07 21:50:55 david__schmidt
95 * A few memory leaks plugged (mostly on error paths)
97 * Revision 1.35.2.6 2003/12/17 16:34:40 oes
100 * Revision 1.35.2.5 2003/04/29 11:32:54 oes
101 * Don't rely on h_addr being non-NULL after gethostbyname.
102 * Works around an oddness in Max OSX and closes bug #724796
104 * Revision 1.35.2.4 2003/04/04 12:40:20 oes
105 * Made sure the errno set by bind, not close[socket] is used in
106 * bind_port. Probably fixes bugs #713777, #705562.
108 * Revision 1.35.2.3 2003/03/07 03:41:04 david__schmidt
109 * 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.
111 * Revision 1.35.2.2 2002/11/20 14:37:24 oes
112 * Fixed Win32 error logging in bind_port.
113 * Thanks to Oliver Stoeneberg for the hint.
115 * Revision 1.35.2.1 2002/05/26 23:41:27 joergs
116 * AmigaOS: Fixed wrong type of len in write_socket()
118 * Revision 1.35 2002/04/26 15:50:04 joergs
119 * AmigaOS: No socklen_t, added AMIGA to the systems using int instead.
121 * Revision 1.34 2002/04/08 20:31:41 swa
124 * Revision 1.33 2002/04/03 16:02:18 gliptak
125 * Correcting compile warning with older gcc
127 * Revision 1.32 2002/03/31 17:18:59 jongfoster
128 * Win32 only: Enabling STRICT to fix a VC++ compile warning.
130 * Revision 1.31 2002/03/29 03:33:13 david__schmidt
131 * Fix Mac OSX compiler warnings
133 * Revision 1.30 2002/03/27 14:32:43 david__schmidt
134 * More compiler warning message maintenance
136 * Revision 1.29 2002/03/26 22:29:54 swa
137 * we have a new homepage!
139 * Revision 1.28 2002/03/24 13:25:43 swa
140 * name change related issues
142 * Revision 1.27 2002/03/13 00:27:05 jongfoster
145 * Revision 1.26 2002/03/11 22:07:02 david__schmidt
146 * OS/2 port maintenance:
147 * - Fixed EMX build - it had decayed a little
148 * - Fixed inexplicable crash during FD_ZERO - must be due to a bad macro.
149 * substituted a memset for now.
151 * Revision 1.25 2002/03/09 20:03:52 jongfoster
152 * - Making various functions return int rather than size_t.
153 * (Undoing a recent change). Since size_t is unsigned on
154 * Windows, functions like read_socket that return -1 on
155 * error cannot return a size_t.
157 * THIS WAS A MAJOR BUG - it caused frequent, unpredictable
158 * crashes, and also frequently caused JB to jump to 100%
159 * CPU and stay there. (Because it thought it had just
160 * read ((unsigned)-1) == 4Gb of data...)
162 * - The signature of write_socket has changed, it now simply
163 * returns success=0/failure=nonzero.
165 * - Trying to get rid of a few warnings --with-debug on
166 * Windows, I've introduced a new type "jb_socket". This is
167 * used for the socket file descriptors. On Windows, this
168 * is SOCKET (a typedef for unsigned). Everywhere else, it's
169 * an int. The error value can't be -1 any more, so it's
170 * now JB_INVALID_SOCKET (which is -1 on UNIX, and in
171 * Windows it maps to the #define INVALID_SOCKET.)
173 * - The signature of bind_port has changed.
175 * Revision 1.24 2002/03/07 03:51:36 oes
176 * - Improved handling of failed DNS lookups
177 * - Fixed compiler warnings etc
179 * Revision 1.23 2002/03/05 00:36:01 jongfoster
180 * Fixing bug 514988 - unable to restart Junkbuster
182 * Revision 1.22 2002/03/04 02:08:02 david__schmidt
183 * Enable web editing of actions file on OS/2 (it had been broken all this time!)
185 * Revision 1.21 2002/01/09 14:32:33 oes
186 * Added support for gethostbyname_r and gethostbyaddr_r.
188 * Revision 1.20 2001/11/16 00:48:48 jongfoster
189 * Enabling duplicate-socket detection for all platforms, not
192 * Revision 1.19 2001/10/25 03:40:47 david__schmidt
193 * Change in porting tactics: OS/2's EMX porting layer doesn't allow multiple
194 * threads to call select() simultaneously. So, it's time to do a real, live,
195 * native OS/2 port. See defines for __EMX__ (the porting layer) vs. __OS2__
196 * (native). Both versions will work, but using __OS2__ offers multi-threading.
198 * Revision 1.18 2001/09/21 23:02:02 david__schmidt
199 * Cleaning up 2 compiler warnings on OS/2.
201 * Revision 1.17 2001/09/13 20:11:46 jongfoster
202 * Fixing 2 compiler warnings under Win32
204 * Revision 1.16 2001/07/30 22:08:36 jongfoster
205 * Tidying up #defines:
206 * - All feature #defines are now of the form FEATURE_xxx
207 * - Permanently turned off WIN_GUI_EDIT
208 * - Permanently turned on WEBDAV and SPLIT_PROXY_ARGS
210 * Revision 1.15 2001/07/29 17:40:43 jongfoster
211 * Fixed compiler warning by adding a cast
213 * Revision 1.14 2001/07/18 13:47:59 oes
214 * Eliminated dirty hack for getsockbyname()
216 * Revision 1.13 2001/07/15 13:56:57 jongfoster
217 * Removing unused local variable.
219 * Revision 1.12 2001/07/01 17:04:11 oes
220 * Bugfix: accept_connection no longer uses the obsolete hstrerror() function
222 * Revision 1.11 2001/06/29 21:45:41 oes
223 * Indentation, CRLF->LF, Tab-> Space
225 * Revision 1.10 2001/06/29 13:29:15 oes
226 * - Added remote (server) host IP to csp->http->host_ip_addr_str
227 * - Added detection of local socket IP and fqdn
228 * - Removed logentry from cancelled commit
230 * Revision 1.9 2001/06/07 23:06:09 jongfoster
231 * The host parameter to connect_to() is now const.
233 * Revision 1.8 2001/06/03 19:12:07 oes
236 * Revision 1.7 2001/05/28 16:14:00 jongfoster
237 * Fixing bug in LOG_LEVEL_LOG
239 * Revision 1.6 2001/05/26 17:28:32 jongfoster
240 * Fixed LOG_LEVEL_LOG
242 * Revision 1.5 2001/05/26 15:26:15 jongfoster
243 * ACL feature now provides more security by immediately dropping
244 * connections from untrusted hosts.
246 * Revision 1.4 2001/05/26 00:37:42 jongfoster
247 * Cosmetic indentation correction.
249 * Revision 1.3 2001/05/25 21:57:54 jongfoster
250 * Now gives a warning under Windows if you try to bind
251 * it to a port that's already in use.
253 * Revision 1.2 2001/05/17 23:01:01 oes
254 * - Cleaned CRLF's from the sources and related files
256 * Revision 1.1.1.1 2001/05/15 13:58:54 oes
257 * Initial import of version 2.9.3 source tree
260 *********************************************************************/
270 #include <sys/types.h>
278 #include <sys/timeb.h>
286 #include <sys/time.h>
287 #include <netinet/in.h>
288 #include <sys/ioctl.h>
290 #include <sys/socket.h>
293 #include <netinet/tcp.h>
295 #include <arpa/inet.h>
301 #if defined(__EMX__) || defined (__OS2__)
302 #include <sys/select.h> /* OS/2/EMX needs a little help with select */
312 #ifdef FEATURE_PTHREAD
314 /* jcc.h is for mutex semaphores only */
315 #endif /* def FEATURE_PTHREAD */
317 #include "jbsockets.h"
321 const char jbsockets_h_rcs[] = JBSOCKETS_H_VERSION;
324 * Maximum number of gethostbyname(_r) retries in case of
325 * soft errors (TRY_AGAIN).
326 * XXX: Does it make sense to make this a config option?
328 #define MAX_DNS_RETRIES 10
330 #define MAX_LISTEN_BACKLOG 128
333 /*********************************************************************
335 * Function : connect_to
337 * Description : Open a socket and connect to it. Will check
338 * that this is allowed according to ACL.
341 * 1 : host = hostname to connect to
342 * 2 : portnum = port to connent on (XXX: should be unsigned)
343 * 3 : csp = Current client state (buffers, headers, etc...)
344 * Not modified, only used for source IP and ACL.
346 * Returns : JB_INVALID_SOCKET => failure, else it is the socket
349 *********************************************************************/
350 jb_socket connect_to(const char *host, int portnum, struct client_state *csp)
352 struct sockaddr_in inaddr;
356 struct timeval tv[1];
357 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA)
359 #endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) */
362 struct access_control_addr dst[1];
363 #endif /* def FEATURE_ACL */
365 memset((char *)&inaddr, 0, sizeof inaddr);
367 if ((addr = resolve_hostname_to_ip(host)) == INADDR_NONE)
369 csp->http->host_ip_addr_str = strdup("unknown");
370 return(JB_INVALID_SOCKET);
374 dst->addr = ntohl(addr);
377 if (block_acl(dst, csp))
384 return(JB_INVALID_SOCKET);
386 #endif /* def FEATURE_ACL */
388 inaddr.sin_addr.s_addr = addr;
389 inaddr.sin_family = AF_INET;
390 csp->http->host_ip_addr_str = strdup(inet_ntoa(inaddr.sin_addr));
393 if (sizeof(inaddr.sin_port) == sizeof(short))
394 #endif /* ndef _WIN32 */
396 inaddr.sin_port = htons((unsigned short) portnum);
401 inaddr.sin_port = htonl((unsigned long)portnum);
403 #endif /* ndef _WIN32 */
406 if ((fd = socket(inaddr.sin_family, SOCK_STREAM, 0)) == JB_INVALID_SOCKET)
408 if ((fd = socket(inaddr.sin_family, SOCK_STREAM, 0)) < 0)
411 return(JB_INVALID_SOCKET);
415 { /* turn off TCP coalescence */
417 setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, (char *) &mi, sizeof (int));
419 #endif /* def TCP_NODELAY */
421 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
422 if ((flags = fcntl(fd, F_GETFL, 0)) != -1)
425 fcntl(fd, F_SETFL, flags);
427 #endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__) */
429 while (connect(fd, (struct sockaddr *) & inaddr, sizeof inaddr) == JB_INVALID_SOCKET)
432 if (errno == WSAEINPROGRESS)
434 if (sock_errno() == EINPROGRESS)
435 #else /* ifndef _WIN32 */
436 if (errno == EINPROGRESS)
437 #endif /* ndef _WIN32 || __OS2__ */
443 if (sock_errno() != EINTR)
449 return(JB_INVALID_SOCKET);
453 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
457 fcntl(fd, F_SETFL, flags);
459 #endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__) */
461 /* wait for connection to complete */
468 /* MS Windows uses int, not SOCKET, for the 1st arg of select(). Wierd! */
469 if (select((int)fd + 1, NULL, &wfds, NULL, tv) <= 0)
472 return(JB_INVALID_SOCKET);
479 /*********************************************************************
481 * Function : write_socket
483 * Description : Write the contents of buf (for n bytes) to socket fd.
486 * 1 : fd = file descriptor (aka. handle) of socket to write to.
487 * 2 : buf = pointer to data to be written.
488 * 3 : len = length of data to be written to the socket "fd".
490 * Returns : 0 on success (entire buffer sent).
493 *********************************************************************/
495 int write_socket(jb_socket fd, const char *buf, ssize_t len)
497 int write_socket(jb_socket fd, const char *buf, size_t len)
505 if (len < 0) /* constant condition - size_t isn't ever negative */
510 log_error(LOG_LEVEL_LOG, "%N", len, buf);
513 return (send(fd, buf, (int)len, 0) != (int)len);
514 #elif defined(__BEOS__) || defined(AMIGA)
515 return (send(fd, buf, len, 0) != len);
516 #elif defined(__OS2__)
518 * Break the data up into SOCKET_SEND_MAX chunks for sending...
519 * OS/2 seemed to complain when the chunks were too large.
521 #define SOCKET_SEND_MAX 65000
523 int write_len = 0, send_len, send_rc = 0, i = 0;
524 while ((i < len) && (send_rc != -1))
526 if ((i + SOCKET_SEND_MAX) > len)
529 send_len = SOCKET_SEND_MAX;
530 send_rc = send(fd,(char*)buf + i, send_len, 0);
538 return (write(fd, buf, len) != len);
544 /*********************************************************************
546 * Function : read_socket
548 * Description : Read from a TCP/IP socket in a platform independent way.
551 * 1 : fd = file descriptor of the socket to read
552 * 2 : buf = pointer to buffer where data will be written
553 * Must be >= len bytes long.
554 * 3 : len = maximum number of bytes to read
556 * Returns : On success, the number of bytes read is returned (zero
557 * indicates end of file), and the file position is advanced
558 * by this number. It is not an error if this number is
559 * smaller than the number of bytes requested; this may hap-
560 * pen for example because fewer bytes are actually available
561 * right now (maybe because we were close to end-of-file, or
562 * because we are reading from a pipe, or from a terminal,
563 * or because read() was interrupted by a signal). On error,
564 * -1 is returned, and errno is set appropriately. In this
565 * case it is left unspecified whether the file position (if
568 *********************************************************************/
569 int read_socket(jb_socket fd, char *buf, int len)
577 return(recv(fd, buf, len, 0));
578 #elif defined(__BEOS__) || defined(AMIGA) || defined(__OS2__)
579 return(recv(fd, buf, (size_t)len, 0));
581 return(read(fd, buf, (size_t)len));
586 /*********************************************************************
588 * Function : close_socket
590 * Description : Closes a TCP/IP socket
593 * 1 : fd = file descriptor of socket to be closed
597 *********************************************************************/
598 void close_socket(jb_socket fd)
600 #if defined(_WIN32) || defined(__BEOS__)
604 #elif defined(__OS2__)
613 /*********************************************************************
615 * Function : bind_port
617 * Description : Call socket, set socket options, and listen.
618 * Called by listen_loop to "boot up" our proxy address.
621 * 1 : hostnam = TCP/IP address to bind/listen to
622 * 2 : portnum = port to listen on
623 * 3 : pfd = pointer used to return file descriptor.
625 * Returns : if success, returns 0 and sets *pfd.
626 * if failure, returns -3 if address is in use,
627 * -2 if address unresolvable,
629 *********************************************************************/
630 int bind_port(const char *hostnam, int portnum, jb_socket *pfd)
632 struct sockaddr_in inaddr;
636 #endif /* ndef _WIN32 */
638 *pfd = JB_INVALID_SOCKET;
640 memset((char *)&inaddr, '\0', sizeof inaddr);
642 inaddr.sin_family = AF_INET;
643 inaddr.sin_addr.s_addr = resolve_hostname_to_ip(hostnam);
645 if (inaddr.sin_addr.s_addr == INADDR_NONE)
651 if (sizeof(inaddr.sin_port) == sizeof(short))
652 #endif /* ndef _WIN32 */
654 inaddr.sin_port = htons((unsigned short) portnum);
659 inaddr.sin_port = htonl((unsigned long) portnum);
661 #endif /* ndef _WIN32 */
663 fd = socket(AF_INET, SOCK_STREAM, 0);
666 if (fd == JB_INVALID_SOCKET)
676 * This is not needed for Win32 - in fact, it stops
677 * duplicate instances of Privoxy from being caught.
679 * On UNIX, we assume the user is sensible enough not
680 * to start Privoxy multiple times on the same IP.
681 * Without this, stopping and restarting Privoxy
682 * from a script fails.
683 * Note: SO_REUSEADDR is meant to only take over
684 * sockets which are *not* in listen state in Linux,
685 * e.g. sockets in TIME_WAIT. YMMV.
687 setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char *)&one, sizeof(one));
688 #endif /* ndef _WIN32 */
690 if (bind(fd, (struct sockaddr *)&inaddr, sizeof(inaddr)) < 0)
693 errno = WSAGetLastError();
694 if (errno == WSAEADDRINUSE)
696 if (errno == EADDRINUSE)
709 while (listen(fd, MAX_LISTEN_BACKLOG) == -1)
723 /*********************************************************************
725 * Function : get_host_information
727 * Description : Determines the IP address the client used to
728 * reach us and the hostname associated with it.
730 * XXX: Most of the code has been copy and pasted
731 * from accept_connection() and not all of the
732 * ifdefs paths have been tested afterwards.
735 * 1 : afd = File descriptor returned from accept().
736 * 2 : ip_address = Pointer to return the pointer to
737 * the ip address string.
738 * 3 : hostname = Pointer to return the pointer to
739 * the hostname or NULL if the caller
740 * isn't interested in it.
744 *********************************************************************/
745 void get_host_information(jb_socket afd, char **ip_address, char **hostname)
747 struct sockaddr_in server;
748 struct hostent *host = NULL;
749 #if defined(_WIN32) || defined(__OS2__) || defined(__APPLE_CC__) || defined(AMIGA)
750 /* according to accept_connection() this fixes a warning. */
755 #if defined(HAVE_GETHOSTBYADDR_R_8_ARGS) || defined(HAVE_GETHOSTBYADDR_R_7_ARGS) || defined(HAVE_GETHOSTBYADDR_R_5_ARGS)
756 struct hostent result;
757 #if defined(HAVE_GETHOSTBYADDR_R_5_ARGS)
758 struct hostent_data hdata;
760 char hbuf[HOSTENT_BUFFER_SIZE];
762 #endif /* def HAVE_GETHOSTBYADDR_R_5_ARGS */
763 #endif /* def HAVE_GETHOSTBYADDR_R_(8|7|5)_ARGS */
764 s_length = sizeof(server);
766 if (NULL != hostname)
772 if (!getsockname(afd, (struct sockaddr *) &server, &s_length))
774 *ip_address = strdup(inet_ntoa(server.sin_addr));
776 if (NULL == hostname)
779 * We're done here, the caller isn't
780 * interested in knowing the hostname.
784 #if defined(HAVE_GETHOSTBYADDR_R_8_ARGS)
785 gethostbyaddr_r((const char *)&server.sin_addr,
786 sizeof(server.sin_addr), AF_INET,
787 &result, hbuf, HOSTENT_BUFFER_SIZE,
789 #elif defined(HAVE_GETHOSTBYADDR_R_7_ARGS)
790 host = gethostbyaddr_r((const char *)&server.sin_addr,
791 sizeof(server.sin_addr), AF_INET,
792 &result, hbuf, HOSTENT_BUFFER_SIZE, &thd_err);
793 #elif defined(HAVE_GETHOSTBYADDR_R_5_ARGS)
794 if (0 == gethostbyaddr_r((const char *)&server.sin_addr,
795 sizeof(server.sin_addr), AF_INET,
804 #elif FEATURE_PTHREAD
805 privoxy_mutex_lock(&resolver_mutex);
806 host = gethostbyaddr((const char *)&server.sin_addr,
807 sizeof(server.sin_addr), AF_INET);
808 privoxy_mutex_unlock(&resolver_mutex);
810 host = gethostbyaddr((const char *)&server.sin_addr,
811 sizeof(server.sin_addr), AF_INET);
815 log_error(LOG_LEVEL_ERROR, "Unable to get my own hostname: %E\n");
819 *hostname = strdup(host->h_name);
827 /*********************************************************************
829 * Function : accept_connection
831 * Description : Accepts a connection on a socket. Socket must have
832 * been created using bind_port().
835 * 1 : csp = Client state, cfd, ip_addr_str, and
836 * ip_addr_long will be set by this routine.
837 * 2 : fd = file descriptor returned from bind_port
839 * Returns : when a connection is accepted, it returns 1 (TRUE).
840 * On an error it returns 0 (FALSE).
842 *********************************************************************/
843 int accept_connection(struct client_state * csp, jb_socket fd)
845 struct sockaddr_in client;
847 #if defined(_WIN32) || defined(__OS2__) || defined(__APPLE_CC__) || defined(AMIGA)
848 /* Wierdness - fix a warning. */
854 c_length = sizeof(client);
857 afd = accept (fd, (struct sockaddr *) &client, &c_length);
858 if (afd == JB_INVALID_SOCKET)
865 afd = accept (fd, (struct sockaddr *) &client, &c_length);
866 } while (afd < 1 && errno == EINTR);
874 csp->ip_addr_str = strdup(inet_ntoa(client.sin_addr));
875 csp->ip_addr_long = ntohl(client.sin_addr.s_addr);
882 /*********************************************************************
884 * Function : resolve_hostname_to_ip
886 * Description : Resolve a hostname to an internet tcp/ip address.
887 * NULL or an empty string resolve to INADDR_ANY.
890 * 1 : host = hostname to resolve
892 * Returns : INADDR_NONE => failure, INADDR_ANY or tcp/ip address if succesful.
894 *********************************************************************/
895 unsigned long resolve_hostname_to_ip(const char *host)
897 struct sockaddr_in inaddr;
898 struct hostent *hostp;
899 unsigned int dns_retries = 0;
900 #if defined(HAVE_GETHOSTBYNAME_R_6_ARGS) || defined(HAVE_GETHOSTBYNAME_R_5_ARGS) || defined(HAVE_GETHOSTBYNAME_R_3_ARGS)
901 struct hostent result;
902 #if defined(HAVE_GETHOSTBYNAME_R_6_ARGS) || defined(HAVE_GETHOSTBYNAME_R_5_ARGS)
903 char hbuf[HOSTENT_BUFFER_SIZE];
905 #else /* defined(HAVE_GETHOSTBYNAME_R_3_ARGS) */
906 struct hostent_data hdata;
907 #endif /* def HAVE_GETHOSTBYNAME_R_(6|5)_ARGS */
908 #endif /* def HAVE_GETHOSTBYNAME_R_(6|5|3)_ARGS */
910 if ((host == NULL) || (*host == '\0'))
915 memset((char *) &inaddr, 0, sizeof inaddr);
917 if ((inaddr.sin_addr.s_addr = inet_addr(host)) == -1)
919 #if defined(HAVE_GETHOSTBYNAME_R_6_ARGS)
920 while (gethostbyname_r(host, &result, hbuf,
921 HOSTENT_BUFFER_SIZE, &hostp, &thd_err)
922 && (thd_err == TRY_AGAIN) && (dns_retries++ < MAX_DNS_RETRIES))
924 log_error(LOG_LEVEL_ERROR,
925 "Timeout #%u while trying to resolve %s. Trying again.",
928 #elif defined(HAVE_GETHOSTBYNAME_R_5_ARGS)
929 while (NULL == (hostp = gethostbyname_r(host, &result,
930 hbuf, HOSTENT_BUFFER_SIZE, &thd_err))
931 && (thd_err == TRY_AGAIN) && (dns_retries++ < MAX_DNS_RETRIES))
933 log_error(LOG_LEVEL_ERROR,
934 "Timeout #%u while trying to resolve %s. Trying again.",
937 #elif defined(HAVE_GETHOSTBYNAME_R_3_ARGS)
939 * XXX: Doesn't retry in case of soft errors.
940 * Does this gethostbyname_r version set h_errno?
942 if (0 == gethostbyname_r(host, &result, &hdata))
950 #elif FEATURE_PTHREAD
951 privoxy_mutex_lock(&resolver_mutex);
952 while (NULL == (hostp = gethostbyname(host))
953 && (h_errno == TRY_AGAIN) && (dns_retries++ < MAX_DNS_RETRIES))
955 log_error(LOG_LEVEL_ERROR,
956 "Timeout #%u while trying to resolve %s. Trying again.",
959 privoxy_mutex_unlock(&resolver_mutex);
961 while (NULL == (hostp = gethostbyname(host))
962 && (h_errno == TRY_AGAIN) && (dns_retries++ < MAX_DNS_RETRIES))
964 log_error(LOG_LEVEL_ERROR,
965 "Timeout #%u while trying to resolve %s. Trying again.",
968 #endif /* def HAVE_GETHOSTBYNAME_R_(6|5|3)_ARGS */
970 * On Mac OSX, if a domain exists but doesn't have a type A
971 * record associated with it, the h_addr member of the struct
972 * hostent returned by gethostbyname is NULL, even if h_length
973 * is 4. Therefore the second test below.
975 if (hostp == NULL || hostp->h_addr == NULL)
978 log_error(LOG_LEVEL_ERROR, "could not resolve hostname %s", host);
981 if (hostp->h_addrtype != AF_INET)
984 errno = WSAEPROTOTYPE;
988 log_error(LOG_LEVEL_ERROR, "hostname %s resolves to unknown address type.", host);
992 (char *) &inaddr.sin_addr,
993 (char *) hostp->h_addr,
994 sizeof(inaddr.sin_addr)
997 return(inaddr.sin_addr.s_addr);