1 const char jbsockets_rcs[] = "$Id: jbsockets.c,v 1.44 2007/09/15 13:01:31 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 1.44 2007/09/15 13:01:31 fabiankeil
39 * Increase listen() backlog to SOMAXCONN (or 128) to decrease
40 * chances of dropped connections under load. Problem reported
41 * and fix suggested by nobody in BR#1795281.
43 * Revision 1.43 2007/06/01 18:16:36 fabiankeil
44 * Use the same mutex for gethostbyname() and gethostbyaddr() to prevent
45 * deadlocks and crashes on OpenBSD and possibly other OS with neither
46 * gethostbyname_r() nor gethostaddr_r(). Closes BR#1729174.
47 * Thanks to Ralf Horstmann for report and solution.
49 * Revision 1.42 2007/04/01 17:37:07 fabiankeil
50 * - Add DNS retries for Solaris and other systems
51 * whose gethostbyname_r version takes five arguments.
52 * - Move maximum number of DNS retries into a macro.
54 * Revision 1.41 2006/11/13 19:05:51 fabiankeil
55 * Make pthread mutex locking more generic. Instead of
56 * checking for OSX and OpenBSD, check for FEATURE_PTHREAD
57 * and use mutex locking unless there is an _r function
58 * available. Better safe than sorry.
60 * Fixes "./configure --disable-pthread" and should result
61 * in less threading-related problems on pthread-using platforms,
62 * but it still doesn't fix BR#1122404.
64 * Revision 1.40 2006/09/02 15:36:42 fabiankeil
65 * Follow the OpenBSD port's lead and protect the resolve
66 * functions on OpenBSD as well.
68 * Revision 1.39 2006/08/03 02:46:41 david__schmidt
69 * Incorporate Fabian Keil's patch work:
\rhttp://www.fabiankeil.de/sourcecode/privoxy/
71 * Revision 1.38 2006/07/18 14:48:46 david__schmidt
72 * Reorganizing the repository: swapping out what was HEAD (the old 3.1 branch)
73 * with what was really the latest development (the v_3_0_branch branch)
75 * Revision 1.35.2.8 2006/01/21 16:16:08 david__schmidt
76 * Thanks to Edward Carrel for his patch to modernize OSX's
\rpthreads support. See bug #1409623.
78 * Revision 1.35.2.7 2005/05/07 21:50:55 david__schmidt
79 * A few memory leaks plugged (mostly on error paths)
81 * Revision 1.35.2.6 2003/12/17 16:34:40 oes
84 * Revision 1.35.2.5 2003/04/29 11:32:54 oes
85 * Don't rely on h_addr being non-NULL after gethostbyname.
86 * Works around an oddness in Max OSX and closes bug #724796
88 * Revision 1.35.2.4 2003/04/04 12:40:20 oes
89 * Made sure the errno set by bind, not close[socket] is used in
90 * bind_port. Probably fixes bugs #713777, #705562.
92 * Revision 1.35.2.3 2003/03/07 03:41:04 david__schmidt
93 * 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.
95 * Revision 1.35.2.2 2002/11/20 14:37:24 oes
96 * Fixed Win32 error logging in bind_port.
97 * Thanks to Oliver Stoeneberg for the hint.
99 * Revision 1.35.2.1 2002/05/26 23:41:27 joergs
100 * AmigaOS: Fixed wrong type of len in write_socket()
102 * Revision 1.35 2002/04/26 15:50:04 joergs
103 * AmigaOS: No socklen_t, added AMIGA to the systems using int instead.
105 * Revision 1.34 2002/04/08 20:31:41 swa
108 * Revision 1.33 2002/04/03 16:02:18 gliptak
109 * Correcting compile warning with older gcc
111 * Revision 1.32 2002/03/31 17:18:59 jongfoster
112 * Win32 only: Enabling STRICT to fix a VC++ compile warning.
114 * Revision 1.31 2002/03/29 03:33:13 david__schmidt
115 * Fix Mac OSX compiler warnings
117 * Revision 1.30 2002/03/27 14:32:43 david__schmidt
118 * More compiler warning message maintenance
120 * Revision 1.29 2002/03/26 22:29:54 swa
121 * we have a new homepage!
123 * Revision 1.28 2002/03/24 13:25:43 swa
124 * name change related issues
126 * Revision 1.27 2002/03/13 00:27:05 jongfoster
129 * Revision 1.26 2002/03/11 22:07:02 david__schmidt
130 * OS/2 port maintenance:
131 * - Fixed EMX build - it had decayed a little
132 * - Fixed inexplicable crash during FD_ZERO - must be due to a bad macro.
133 * substituted a memset for now.
135 * Revision 1.25 2002/03/09 20:03:52 jongfoster
136 * - Making various functions return int rather than size_t.
137 * (Undoing a recent change). Since size_t is unsigned on
138 * Windows, functions like read_socket that return -1 on
139 * error cannot return a size_t.
141 * THIS WAS A MAJOR BUG - it caused frequent, unpredictable
142 * crashes, and also frequently caused JB to jump to 100%
143 * CPU and stay there. (Because it thought it had just
144 * read ((unsigned)-1) == 4Gb of data...)
146 * - The signature of write_socket has changed, it now simply
147 * returns success=0/failure=nonzero.
149 * - Trying to get rid of a few warnings --with-debug on
150 * Windows, I've introduced a new type "jb_socket". This is
151 * used for the socket file descriptors. On Windows, this
152 * is SOCKET (a typedef for unsigned). Everywhere else, it's
153 * an int. The error value can't be -1 any more, so it's
154 * now JB_INVALID_SOCKET (which is -1 on UNIX, and in
155 * Windows it maps to the #define INVALID_SOCKET.)
157 * - The signature of bind_port has changed.
159 * Revision 1.24 2002/03/07 03:51:36 oes
160 * - Improved handling of failed DNS lookups
161 * - Fixed compiler warnings etc
163 * Revision 1.23 2002/03/05 00:36:01 jongfoster
164 * Fixing bug 514988 - unable to restart Junkbuster
166 * Revision 1.22 2002/03/04 02:08:02 david__schmidt
167 * Enable web editing of actions file on OS/2 (it had been broken all this time!)
169 * Revision 1.21 2002/01/09 14:32:33 oes
170 * Added support for gethostbyname_r and gethostbyaddr_r.
172 * Revision 1.20 2001/11/16 00:48:48 jongfoster
173 * Enabling duplicate-socket detection for all platforms, not
176 * Revision 1.19 2001/10/25 03:40:47 david__schmidt
177 * Change in porting tactics: OS/2's EMX porting layer doesn't allow multiple
178 * threads to call select() simultaneously. So, it's time to do a real, live,
179 * native OS/2 port. See defines for __EMX__ (the porting layer) vs. __OS2__
180 * (native). Both versions will work, but using __OS2__ offers multi-threading.
182 * Revision 1.18 2001/09/21 23:02:02 david__schmidt
183 * Cleaning up 2 compiler warnings on OS/2.
185 * Revision 1.17 2001/09/13 20:11:46 jongfoster
186 * Fixing 2 compiler warnings under Win32
188 * Revision 1.16 2001/07/30 22:08:36 jongfoster
189 * Tidying up #defines:
190 * - All feature #defines are now of the form FEATURE_xxx
191 * - Permanently turned off WIN_GUI_EDIT
192 * - Permanently turned on WEBDAV and SPLIT_PROXY_ARGS
194 * Revision 1.15 2001/07/29 17:40:43 jongfoster
195 * Fixed compiler warning by adding a cast
197 * Revision 1.14 2001/07/18 13:47:59 oes
198 * Eliminated dirty hack for getsockbyname()
200 * Revision 1.13 2001/07/15 13:56:57 jongfoster
201 * Removing unused local variable.
203 * Revision 1.12 2001/07/01 17:04:11 oes
204 * Bugfix: accept_connection no longer uses the obsolete hstrerror() function
206 * Revision 1.11 2001/06/29 21:45:41 oes
207 * Indentation, CRLF->LF, Tab-> Space
209 * Revision 1.10 2001/06/29 13:29:15 oes
210 * - Added remote (server) host IP to csp->http->host_ip_addr_str
211 * - Added detection of local socket IP and fqdn
212 * - Removed logentry from cancelled commit
214 * Revision 1.9 2001/06/07 23:06:09 jongfoster
215 * The host parameter to connect_to() is now const.
217 * Revision 1.8 2001/06/03 19:12:07 oes
220 * Revision 1.7 2001/05/28 16:14:00 jongfoster
221 * Fixing bug in LOG_LEVEL_LOG
223 * Revision 1.6 2001/05/26 17:28:32 jongfoster
224 * Fixed LOG_LEVEL_LOG
226 * Revision 1.5 2001/05/26 15:26:15 jongfoster
227 * ACL feature now provides more security by immediately dropping
228 * connections from untrusted hosts.
230 * Revision 1.4 2001/05/26 00:37:42 jongfoster
231 * Cosmetic indentation correction.
233 * Revision 1.3 2001/05/25 21:57:54 jongfoster
234 * Now gives a warning under Windows if you try to bind
235 * it to a port that's already in use.
237 * Revision 1.2 2001/05/17 23:01:01 oes
238 * - Cleaned CRLF's from the sources and related files
240 * Revision 1.1.1.1 2001/05/15 13:58:54 oes
241 * Initial import of version 2.9.3 source tree
244 *********************************************************************/
254 #include <sys/types.h>
262 #include <sys/timeb.h>
270 #include <sys/time.h>
271 #include <netinet/in.h>
272 #include <sys/ioctl.h>
274 #include <sys/socket.h>
277 #include <netinet/tcp.h>
279 #include <arpa/inet.h>
285 #if defined(__EMX__) || defined (__OS2__)
286 #include <sys/select.h> /* OS/2/EMX needs a little help with select */
296 #ifdef FEATURE_PTHREAD
298 /* jcc.h is for mutex semaphores only */
299 #endif /* def FEATURE_PTHREAD */
301 #include "jbsockets.h"
305 const char jbsockets_h_rcs[] = JBSOCKETS_H_VERSION;
308 * Maximum number of gethostbyname(_r) retries in case of
309 * soft errors (TRY_AGAIN).
310 * XXX: Does it make sense to make this a config option?
312 #define MAX_DNS_RETRIES 10
314 #define MAX_LISTEN_BACKLOG 128
317 /*********************************************************************
319 * Function : connect_to
321 * Description : Open a socket and connect to it. Will check
322 * that this is allowed according to ACL.
325 * 1 : host = hostname to connect to
326 * 2 : portnum = port to connent on
327 * 3 : csp = Current client state (buffers, headers, etc...)
328 * Not modified, only used for source IP and ACL.
330 * Returns : JB_INVALID_SOCKET => failure, else it is the socket
333 *********************************************************************/
334 jb_socket connect_to(const char *host, int portnum, struct client_state *csp)
336 struct sockaddr_in inaddr;
340 struct timeval tv[1];
341 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA)
343 #endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) */
346 struct access_control_addr dst[1];
347 #endif /* def FEATURE_ACL */
349 memset((char *)&inaddr, 0, sizeof inaddr);
351 if ((addr = resolve_hostname_to_ip(host)) == INADDR_NONE)
353 csp->http->host_ip_addr_str = strdup("unknown");
354 return(JB_INVALID_SOCKET);
358 dst->addr = ntohl((unsigned long) addr);
361 if (block_acl(dst, csp))
368 return(JB_INVALID_SOCKET);
370 #endif /* def FEATURE_ACL */
372 inaddr.sin_addr.s_addr = addr;
373 inaddr.sin_family = AF_INET;
374 csp->http->host_ip_addr_str = strdup(inet_ntoa(inaddr.sin_addr));
377 if (sizeof(inaddr.sin_port) == sizeof(short))
378 #endif /* ndef _WIN32 */
380 inaddr.sin_port = htons((unsigned short) portnum);
385 inaddr.sin_port = htonl((unsigned long)portnum);
387 #endif /* ndef _WIN32 */
390 if ((fd = socket(inaddr.sin_family, SOCK_STREAM, 0)) == JB_INVALID_SOCKET)
392 if ((fd = socket(inaddr.sin_family, SOCK_STREAM, 0)) < 0)
395 return(JB_INVALID_SOCKET);
399 { /* turn off TCP coalescence */
401 setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, (char *) &mi, sizeof (int));
403 #endif /* def TCP_NODELAY */
405 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
406 if ((flags = fcntl(fd, F_GETFL, 0)) != -1)
409 fcntl(fd, F_SETFL, flags);
411 #endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__) */
413 while (connect(fd, (struct sockaddr *) & inaddr, sizeof inaddr) == JB_INVALID_SOCKET)
416 if (errno == WSAEINPROGRESS)
418 if (sock_errno() == EINPROGRESS)
419 #else /* ifndef _WIN32 */
420 if (errno == EINPROGRESS)
421 #endif /* ndef _WIN32 || __OS2__ */
427 if (sock_errno() != EINTR)
433 return(JB_INVALID_SOCKET);
437 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
441 fcntl(fd, F_SETFL, flags);
443 #endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__) */
445 /* wait for connection to complete */
452 /* MS Windows uses int, not SOCKET, for the 1st arg of select(). Wierd! */
453 if (select((int)fd + 1, NULL, &wfds, NULL, tv) <= 0)
456 return(JB_INVALID_SOCKET);
463 /*********************************************************************
465 * Function : write_socket
467 * Description : Write the contents of buf (for n bytes) to socket fd.
470 * 1 : fd = file descriptor (aka. handle) of socket to write to.
471 * 2 : buf = pointer to data to be written.
472 * 3 : len = length of data to be written to the socket "fd".
474 * Returns : 0 on success (entire buffer sent).
477 *********************************************************************/
479 int write_socket(jb_socket fd, const char *buf, ssize_t len)
481 int write_socket(jb_socket fd, const char *buf, size_t len)
489 if (len < 0) /* constant condition - size_t isn't ever negative */
494 log_error(LOG_LEVEL_LOG, "%N", len, buf);
497 return (send(fd, buf, (int)len, 0) != (int)len);
498 #elif defined(__BEOS__) || defined(AMIGA)
499 return (send(fd, buf, len, 0) != len);
500 #elif defined(__OS2__)
502 * Break the data up into SOCKET_SEND_MAX chunks for sending...
503 * OS/2 seemed to complain when the chunks were too large.
505 #define SOCKET_SEND_MAX 65000
507 int write_len = 0, send_len, send_rc = 0, i = 0;
508 while ((i < len) && (send_rc != -1))
510 if ((i + SOCKET_SEND_MAX) > len)
513 send_len = SOCKET_SEND_MAX;
514 send_rc = send(fd,(char*)buf + i, send_len, 0);
522 return (write(fd, buf, len) != len);
528 /*********************************************************************
530 * Function : read_socket
532 * Description : Read from a TCP/IP socket in a platform independent way.
535 * 1 : fd = file descriptor of the socket to read
536 * 2 : buf = pointer to buffer where data will be written
537 * Must be >= len bytes long.
538 * 3 : len = maximum number of bytes to read
540 * Returns : On success, the number of bytes read is returned (zero
541 * indicates end of file), and the file position is advanced
542 * by this number. It is not an error if this number is
543 * smaller than the number of bytes requested; this may hap-
544 * pen for example because fewer bytes are actually available
545 * right now (maybe because we were close to end-of-file, or
546 * because we are reading from a pipe, or from a terminal,
547 * or because read() was interrupted by a signal). On error,
548 * -1 is returned, and errno is set appropriately. In this
549 * case it is left unspecified whether the file position (if
552 *********************************************************************/
553 int read_socket(jb_socket fd, char *buf, int len)
561 return(recv(fd, buf, len, 0));
562 #elif defined(__BEOS__) || defined(AMIGA) || defined(__OS2__)
563 return(recv(fd, buf, (size_t)len, 0));
565 return(read(fd, buf, (size_t)len));
570 /*********************************************************************
572 * Function : close_socket
574 * Description : Closes a TCP/IP socket
577 * 1 : fd = file descriptor of socket to be closed
581 *********************************************************************/
582 void close_socket(jb_socket fd)
584 #if defined(_WIN32) || defined(__BEOS__)
588 #elif defined(__OS2__)
597 /*********************************************************************
599 * Function : bind_port
601 * Description : Call socket, set socket options, and listen.
602 * Called by listen_loop to "boot up" our proxy address.
605 * 1 : hostnam = TCP/IP address to bind/listen to
606 * 2 : portnum = port to listen on
607 * 3 : pfd = pointer used to return file descriptor.
609 * Returns : if success, returns 0 and sets *pfd.
610 * if failure, returns -3 if address is in use,
611 * -2 if address unresolvable,
613 *********************************************************************/
614 int bind_port(const char *hostnam, int portnum, jb_socket *pfd)
616 struct sockaddr_in inaddr;
620 #endif /* ndef _WIN32 */
622 *pfd = JB_INVALID_SOCKET;
624 memset((char *)&inaddr, '\0', sizeof inaddr);
626 inaddr.sin_family = AF_INET;
627 inaddr.sin_addr.s_addr = resolve_hostname_to_ip(hostnam);
629 if (inaddr.sin_addr.s_addr == INADDR_NONE)
635 if (sizeof(inaddr.sin_port) == sizeof(short))
636 #endif /* ndef _WIN32 */
638 inaddr.sin_port = htons((unsigned short) portnum);
643 inaddr.sin_port = htonl((unsigned long) portnum);
645 #endif /* ndef _WIN32 */
647 fd = socket(AF_INET, SOCK_STREAM, 0);
650 if (fd == JB_INVALID_SOCKET)
660 * This is not needed for Win32 - in fact, it stops
661 * duplicate instances of Privoxy from being caught.
663 * On UNIX, we assume the user is sensible enough not
664 * to start Privoxy multiple times on the same IP.
665 * Without this, stopping and restarting Privoxy
666 * from a script fails.
667 * Note: SO_REUSEADDR is meant to only take over
668 * sockets which are *not* in listen state in Linux,
669 * e.g. sockets in TIME_WAIT. YMMV.
671 setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char *)&one, sizeof(one));
672 #endif /* ndef _WIN32 */
674 if (bind(fd, (struct sockaddr *)&inaddr, sizeof(inaddr)) < 0)
677 errno = WSAGetLastError();
678 if (errno == WSAEADDRINUSE)
680 if (errno == EADDRINUSE)
693 while (listen(fd, MAX_LISTEN_BACKLOG) == -1)
707 /*********************************************************************
709 * Function : accept_connection
711 * Description : Accepts a connection on a socket. Socket must have
712 * been created using bind_port().
715 * 1 : csp = Client state, cfd, ip_addr_str, and
716 * ip_addr_long will be set by this routine.
717 * 2 : fd = file descriptor returned from bind_port
719 * Returns : when a connection is accepted, it returns 1 (TRUE).
720 * On an error it returns 0 (FALSE).
722 *********************************************************************/
723 int accept_connection(struct client_state * csp, jb_socket fd)
725 struct sockaddr_in client, server;
726 struct hostent *host = NULL;
728 #if defined(_WIN32) || defined(__OS2__) || defined(__APPLE_CC__) || defined(AMIGA)
729 /* Wierdness - fix a warning. */
730 int c_length, s_length;
732 socklen_t c_length, s_length;
734 #if defined(HAVE_GETHOSTBYADDR_R_8_ARGS) || defined(HAVE_GETHOSTBYADDR_R_7_ARGS) || defined(HAVE_GETHOSTBYADDR_R_5_ARGS)
735 struct hostent result;
736 #if defined(HAVE_GETHOSTBYADDR_R_5_ARGS)
737 struct hostent_data hdata;
739 char hbuf[HOSTENT_BUFFER_SIZE];
741 #endif /* def HAVE_GETHOSTBYADDR_R_5_ARGS */
742 #endif /* def HAVE_GETHOSTBYADDR_R_(8|7|5)_ARGS */
744 c_length = s_length = sizeof(client);
747 afd = accept (fd, (struct sockaddr *) &client, &c_length);
748 if (afd == JB_INVALID_SOCKET)
755 afd = accept (fd, (struct sockaddr *) &client, &c_length);
756 } while (afd < 1 && errno == EINTR);
764 * Determine the IP-Adress that the client used to reach us
765 * and the hostname associated with that address
767 if (!getsockname(afd, (struct sockaddr *) &server, &s_length))
769 csp->my_ip_addr_str = strdup(inet_ntoa(server.sin_addr));
770 #if defined(HAVE_GETHOSTBYADDR_R_8_ARGS)
771 gethostbyaddr_r((const char *)&server.sin_addr,
772 sizeof(server.sin_addr), AF_INET,
773 &result, hbuf, HOSTENT_BUFFER_SIZE,
775 #elif defined(HAVE_GETHOSTBYADDR_R_7_ARGS)
776 host = gethostbyaddr_r((const char *)&server.sin_addr,
777 sizeof(server.sin_addr), AF_INET,
778 &result, hbuf, HOSTENT_BUFFER_SIZE, &thd_err);
779 #elif defined(HAVE_GETHOSTBYADDR_R_5_ARGS)
780 if (0 == gethostbyaddr_r((const char *)&server.sin_addr,
781 sizeof(server.sin_addr), AF_INET,
790 #elif FEATURE_PTHREAD
791 pthread_mutex_lock(&resolver_mutex);
792 host = gethostbyaddr((const char *)&server.sin_addr,
793 sizeof(server.sin_addr), AF_INET);
794 pthread_mutex_unlock(&resolver_mutex);
796 host = gethostbyaddr((const char *)&server.sin_addr,
797 sizeof(server.sin_addr), AF_INET);
801 log_error(LOG_LEVEL_ERROR, "Unable to get my own hostname: %E\n");
805 csp->my_hostname = strdup(host->h_name);
810 csp->ip_addr_str = strdup(inet_ntoa(client.sin_addr));
811 csp->ip_addr_long = ntohl(client.sin_addr.s_addr);
818 /*********************************************************************
820 * Function : resolve_hostname_to_ip
822 * Description : Resolve a hostname to an internet tcp/ip address.
823 * NULL or an empty string resolve to INADDR_ANY.
826 * 1 : host = hostname to resolve
828 * Returns : INADDR_NONE => failure, INADDR_ANY or tcp/ip address if succesful.
830 *********************************************************************/
831 unsigned long resolve_hostname_to_ip(const char *host)
833 struct sockaddr_in inaddr;
834 struct hostent *hostp;
835 unsigned int dns_retries = 0;
836 #if defined(HAVE_GETHOSTBYNAME_R_6_ARGS) || defined(HAVE_GETHOSTBYNAME_R_5_ARGS) || defined(HAVE_GETHOSTBYNAME_R_3_ARGS)
837 struct hostent result;
838 #if defined(HAVE_GETHOSTBYNAME_R_6_ARGS) || defined(HAVE_GETHOSTBYNAME_R_5_ARGS)
839 char hbuf[HOSTENT_BUFFER_SIZE];
841 #else /* defined(HAVE_GETHOSTBYNAME_R_3_ARGS) */
842 struct hostent_data hdata;
843 #endif /* def HAVE_GETHOSTBYNAME_R_(6|5)_ARGS */
844 #endif /* def HAVE_GETHOSTBYNAME_R_(6|5|3)_ARGS */
846 if ((host == NULL) || (*host == '\0'))
851 memset((char *) &inaddr, 0, sizeof inaddr);
853 if ((inaddr.sin_addr.s_addr = inet_addr(host)) == -1)
855 #if defined(HAVE_GETHOSTBYNAME_R_6_ARGS)
856 while (gethostbyname_r(host, &result, hbuf,
857 HOSTENT_BUFFER_SIZE, &hostp, &thd_err)
858 && (thd_err == TRY_AGAIN) && (dns_retries++ < MAX_DNS_RETRIES))
860 log_error(LOG_LEVEL_ERROR,
861 "Timeout #%u while trying to resolve %s. Trying again.",
864 #elif defined(HAVE_GETHOSTBYNAME_R_5_ARGS)
865 while (NULL == (hostp = gethostbyname_r(host, &result,
866 hbuf, HOSTENT_BUFFER_SIZE, &thd_err))
867 && (thd_err == TRY_AGAIN) && (dns_retries++ < MAX_DNS_RETRIES))
869 log_error(LOG_LEVEL_ERROR,
870 "Timeout #%u while trying to resolve %s. Trying again.",
873 #elif defined(HAVE_GETHOSTBYNAME_R_3_ARGS)
875 * XXX: Doesn't retry in case of soft errors.
876 * Does this gethostbyname_r version set h_errno?
878 if (0 == gethostbyname_r(host, &result, &hdata))
886 #elif FEATURE_PTHREAD
887 pthread_mutex_lock(&resolver_mutex);
888 while (NULL == (hostp = gethostbyname(host))
889 && (h_errno == TRY_AGAIN) && (dns_retries++ < MAX_DNS_RETRIES))
891 log_error(LOG_LEVEL_ERROR,
892 "Timeout #%u while trying to resolve %s. Trying again.",
895 pthread_mutex_unlock(&resolver_mutex);
897 while (NULL == (hostp = gethostbyname(host))
898 && (h_errno == TRY_AGAIN) && (dns_retries++ < MAX_DNS_RETRIES))
900 log_error(LOG_LEVEL_ERROR,
901 "Timeout #%u while trying to resolve %s. Trying again.",
904 #endif /* def HAVE_GETHOSTBYNAME_R_(6|5|3)_ARGS */
906 * On Mac OSX, if a domain exists but doesn't have a type A
907 * record associated with it, the h_addr member of the struct
908 * hostent returned by gethostbyname is NULL, even if h_length
909 * is 4. Therefore the second test below.
911 if (hostp == NULL || hostp->h_addr == NULL)
914 log_error(LOG_LEVEL_ERROR, "could not resolve hostname %s", host);
917 if (hostp->h_addrtype != AF_INET)
920 errno = WSAEPROTOTYPE;
924 log_error(LOG_LEVEL_ERROR, "hostname %s resolves to unknown address type.", host);
928 (char *) &inaddr.sin_addr,
929 (char *) hostp->h_addr,
930 sizeof(inaddr.sin_addr)
933 return(inaddr.sin_addr.s_addr);