1 const char jbsockets_rcs[] = "$Id: jbsockets.c,v 1.42 2007/04/01 17:37:07 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 1.42 2007/04/01 17:37:07 fabiankeil
39 * - Add DNS retries for Solaris and other systems
40 * whose gethostbyname_r version takes five arguments.
41 * - Move maximum number of DNS retries into a macro.
43 * Revision 1.41 2006/11/13 19:05:51 fabiankeil
44 * Make pthread mutex locking more generic. Instead of
45 * checking for OSX and OpenBSD, check for FEATURE_PTHREAD
46 * and use mutex locking unless there is an _r function
47 * available. Better safe than sorry.
49 * Fixes "./configure --disable-pthread" and should result
50 * in less threading-related problems on pthread-using platforms,
51 * but it still doesn't fix BR#1122404.
53 * Revision 1.40 2006/09/02 15:36:42 fabiankeil
54 * Follow the OpenBSD port's lead and protect the resolve
55 * functions on OpenBSD as well.
57 * Revision 1.39 2006/08/03 02:46:41 david__schmidt
58 * Incorporate Fabian Keil's patch work:
\rhttp://www.fabiankeil.de/sourcecode/privoxy/
60 * Revision 1.38 2006/07/18 14:48:46 david__schmidt
61 * Reorganizing the repository: swapping out what was HEAD (the old 3.1 branch)
62 * with what was really the latest development (the v_3_0_branch branch)
64 * Revision 1.35.2.8 2006/01/21 16:16:08 david__schmidt
65 * Thanks to Edward Carrel for his patch to modernize OSX's
\rpthreads support. See bug #1409623.
67 * Revision 1.35.2.7 2005/05/07 21:50:55 david__schmidt
68 * A few memory leaks plugged (mostly on error paths)
70 * Revision 1.35.2.6 2003/12/17 16:34:40 oes
73 * Revision 1.35.2.5 2003/04/29 11:32:54 oes
74 * Don't rely on h_addr being non-NULL after gethostbyname.
75 * Works around an oddness in Max OSX and closes bug #724796
77 * Revision 1.35.2.4 2003/04/04 12:40:20 oes
78 * Made sure the errno set by bind, not close[socket] is used in
79 * bind_port. Probably fixes bugs #713777, #705562.
81 * Revision 1.35.2.3 2003/03/07 03:41:04 david__schmidt
82 * 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.
84 * Revision 1.35.2.2 2002/11/20 14:37:24 oes
85 * Fixed Win32 error logging in bind_port.
86 * Thanks to Oliver Stoeneberg for the hint.
88 * Revision 1.35.2.1 2002/05/26 23:41:27 joergs
89 * AmigaOS: Fixed wrong type of len in write_socket()
91 * Revision 1.35 2002/04/26 15:50:04 joergs
92 * AmigaOS: No socklen_t, added AMIGA to the systems using int instead.
94 * Revision 1.34 2002/04/08 20:31:41 swa
97 * Revision 1.33 2002/04/03 16:02:18 gliptak
98 * Correcting compile warning with older gcc
100 * Revision 1.32 2002/03/31 17:18:59 jongfoster
101 * Win32 only: Enabling STRICT to fix a VC++ compile warning.
103 * Revision 1.31 2002/03/29 03:33:13 david__schmidt
104 * Fix Mac OSX compiler warnings
106 * Revision 1.30 2002/03/27 14:32:43 david__schmidt
107 * More compiler warning message maintenance
109 * Revision 1.29 2002/03/26 22:29:54 swa
110 * we have a new homepage!
112 * Revision 1.28 2002/03/24 13:25:43 swa
113 * name change related issues
115 * Revision 1.27 2002/03/13 00:27:05 jongfoster
118 * Revision 1.26 2002/03/11 22:07:02 david__schmidt
119 * OS/2 port maintenance:
120 * - Fixed EMX build - it had decayed a little
121 * - Fixed inexplicable crash during FD_ZERO - must be due to a bad macro.
122 * substituted a memset for now.
124 * Revision 1.25 2002/03/09 20:03:52 jongfoster
125 * - Making various functions return int rather than size_t.
126 * (Undoing a recent change). Since size_t is unsigned on
127 * Windows, functions like read_socket that return -1 on
128 * error cannot return a size_t.
130 * THIS WAS A MAJOR BUG - it caused frequent, unpredictable
131 * crashes, and also frequently caused JB to jump to 100%
132 * CPU and stay there. (Because it thought it had just
133 * read ((unsigned)-1) == 4Gb of data...)
135 * - The signature of write_socket has changed, it now simply
136 * returns success=0/failure=nonzero.
138 * - Trying to get rid of a few warnings --with-debug on
139 * Windows, I've introduced a new type "jb_socket". This is
140 * used for the socket file descriptors. On Windows, this
141 * is SOCKET (a typedef for unsigned). Everywhere else, it's
142 * an int. The error value can't be -1 any more, so it's
143 * now JB_INVALID_SOCKET (which is -1 on UNIX, and in
144 * Windows it maps to the #define INVALID_SOCKET.)
146 * - The signature of bind_port has changed.
148 * Revision 1.24 2002/03/07 03:51:36 oes
149 * - Improved handling of failed DNS lookups
150 * - Fixed compiler warnings etc
152 * Revision 1.23 2002/03/05 00:36:01 jongfoster
153 * Fixing bug 514988 - unable to restart Junkbuster
155 * Revision 1.22 2002/03/04 02:08:02 david__schmidt
156 * Enable web editing of actions file on OS/2 (it had been broken all this time!)
158 * Revision 1.21 2002/01/09 14:32:33 oes
159 * Added support for gethostbyname_r and gethostbyaddr_r.
161 * Revision 1.20 2001/11/16 00:48:48 jongfoster
162 * Enabling duplicate-socket detection for all platforms, not
165 * Revision 1.19 2001/10/25 03:40:47 david__schmidt
166 * Change in porting tactics: OS/2's EMX porting layer doesn't allow multiple
167 * threads to call select() simultaneously. So, it's time to do a real, live,
168 * native OS/2 port. See defines for __EMX__ (the porting layer) vs. __OS2__
169 * (native). Both versions will work, but using __OS2__ offers multi-threading.
171 * Revision 1.18 2001/09/21 23:02:02 david__schmidt
172 * Cleaning up 2 compiler warnings on OS/2.
174 * Revision 1.17 2001/09/13 20:11:46 jongfoster
175 * Fixing 2 compiler warnings under Win32
177 * Revision 1.16 2001/07/30 22:08:36 jongfoster
178 * Tidying up #defines:
179 * - All feature #defines are now of the form FEATURE_xxx
180 * - Permanently turned off WIN_GUI_EDIT
181 * - Permanently turned on WEBDAV and SPLIT_PROXY_ARGS
183 * Revision 1.15 2001/07/29 17:40:43 jongfoster
184 * Fixed compiler warning by adding a cast
186 * Revision 1.14 2001/07/18 13:47:59 oes
187 * Eliminated dirty hack for getsockbyname()
189 * Revision 1.13 2001/07/15 13:56:57 jongfoster
190 * Removing unused local variable.
192 * Revision 1.12 2001/07/01 17:04:11 oes
193 * Bugfix: accept_connection no longer uses the obsolete hstrerror() function
195 * Revision 1.11 2001/06/29 21:45:41 oes
196 * Indentation, CRLF->LF, Tab-> Space
198 * Revision 1.10 2001/06/29 13:29:15 oes
199 * - Added remote (server) host IP to csp->http->host_ip_addr_str
200 * - Added detection of local socket IP and fqdn
201 * - Removed logentry from cancelled commit
203 * Revision 1.9 2001/06/07 23:06:09 jongfoster
204 * The host parameter to connect_to() is now const.
206 * Revision 1.8 2001/06/03 19:12:07 oes
209 * Revision 1.7 2001/05/28 16:14:00 jongfoster
210 * Fixing bug in LOG_LEVEL_LOG
212 * Revision 1.6 2001/05/26 17:28:32 jongfoster
213 * Fixed LOG_LEVEL_LOG
215 * Revision 1.5 2001/05/26 15:26:15 jongfoster
216 * ACL feature now provides more security by immediately dropping
217 * connections from untrusted hosts.
219 * Revision 1.4 2001/05/26 00:37:42 jongfoster
220 * Cosmetic indentation correction.
222 * Revision 1.3 2001/05/25 21:57:54 jongfoster
223 * Now gives a warning under Windows if you try to bind
224 * it to a port that's already in use.
226 * Revision 1.2 2001/05/17 23:01:01 oes
227 * - Cleaned CRLF's from the sources and related files
229 * Revision 1.1.1.1 2001/05/15 13:58:54 oes
230 * Initial import of version 2.9.3 source tree
233 *********************************************************************/
243 #include <sys/types.h>
251 #include <sys/timeb.h>
259 #include <sys/time.h>
260 #include <netinet/in.h>
261 #include <sys/ioctl.h>
263 #include <sys/socket.h>
266 #include <netinet/tcp.h>
268 #include <arpa/inet.h>
274 #if defined(__EMX__) || defined (__OS2__)
275 #include <sys/select.h> /* OS/2/EMX needs a little help with select */
285 #ifdef FEATURE_PTHREAD
287 /* jcc.h is for mutex semaphores only */
288 #endif /* def FEATURE_PTHREAD */
290 #include "jbsockets.h"
294 const char jbsockets_h_rcs[] = JBSOCKETS_H_VERSION;
297 * Maximum number of gethostbyname(_r) retries in case of
298 * soft errors (TRY_AGAIN).
299 * XXX: Does it make sense to make this a config option?
301 #define MAX_DNS_RETRIES 10
303 /*********************************************************************
305 * Function : connect_to
307 * Description : Open a socket and connect to it. Will check
308 * that this is allowed according to ACL.
311 * 1 : host = hostname to connect to
312 * 2 : portnum = port to connent on
313 * 3 : csp = Current client state (buffers, headers, etc...)
314 * Not modified, only used for source IP and ACL.
316 * Returns : JB_INVALID_SOCKET => failure, else it is the socket
319 *********************************************************************/
320 jb_socket connect_to(const char *host, int portnum, struct client_state *csp)
322 struct sockaddr_in inaddr;
326 struct timeval tv[1];
327 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA)
329 #endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) */
332 struct access_control_addr dst[1];
333 #endif /* def FEATURE_ACL */
335 memset((char *)&inaddr, 0, sizeof inaddr);
337 if ((addr = resolve_hostname_to_ip(host)) == INADDR_NONE)
339 csp->http->host_ip_addr_str = strdup("unknown");
340 return(JB_INVALID_SOCKET);
344 dst->addr = ntohl((unsigned long) addr);
347 if (block_acl(dst, csp))
354 return(JB_INVALID_SOCKET);
356 #endif /* def FEATURE_ACL */
358 inaddr.sin_addr.s_addr = addr;
359 inaddr.sin_family = AF_INET;
360 csp->http->host_ip_addr_str = strdup(inet_ntoa(inaddr.sin_addr));
363 if (sizeof(inaddr.sin_port) == sizeof(short))
364 #endif /* ndef _WIN32 */
366 inaddr.sin_port = htons((unsigned short) portnum);
371 inaddr.sin_port = htonl((unsigned long)portnum);
373 #endif /* ndef _WIN32 */
376 if ((fd = socket(inaddr.sin_family, SOCK_STREAM, 0)) == JB_INVALID_SOCKET)
378 if ((fd = socket(inaddr.sin_family, SOCK_STREAM, 0)) < 0)
381 return(JB_INVALID_SOCKET);
385 { /* turn off TCP coalescence */
387 setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, (char *) &mi, sizeof (int));
389 #endif /* def TCP_NODELAY */
391 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
392 if ((flags = fcntl(fd, F_GETFL, 0)) != -1)
395 fcntl(fd, F_SETFL, flags);
397 #endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__) */
399 while (connect(fd, (struct sockaddr *) & inaddr, sizeof inaddr) == JB_INVALID_SOCKET)
402 if (errno == WSAEINPROGRESS)
404 if (sock_errno() == EINPROGRESS)
405 #else /* ifndef _WIN32 */
406 if (errno == EINPROGRESS)
407 #endif /* ndef _WIN32 || __OS2__ */
413 if (sock_errno() != EINTR)
419 return(JB_INVALID_SOCKET);
423 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
427 fcntl(fd, F_SETFL, flags);
429 #endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__) */
431 /* wait for connection to complete */
438 /* MS Windows uses int, not SOCKET, for the 1st arg of select(). Wierd! */
439 if (select((int)fd + 1, NULL, &wfds, NULL, tv) <= 0)
442 return(JB_INVALID_SOCKET);
449 /*********************************************************************
451 * Function : write_socket
453 * Description : Write the contents of buf (for n bytes) to socket fd.
456 * 1 : fd = file descriptor (aka. handle) of socket to write to.
457 * 2 : buf = pointer to data to be written.
458 * 3 : len = length of data to be written to the socket "fd".
460 * Returns : 0 on success (entire buffer sent).
463 *********************************************************************/
465 int write_socket(jb_socket fd, const char *buf, ssize_t len)
467 int write_socket(jb_socket fd, const char *buf, size_t len)
475 if (len < 0) /* constant condition - size_t isn't ever negative */
480 log_error(LOG_LEVEL_LOG, "%N", len, buf);
483 return (send(fd, buf, (int)len, 0) != (int)len);
484 #elif defined(__BEOS__) || defined(AMIGA)
485 return (send(fd, buf, len, 0) != len);
486 #elif defined(__OS2__)
488 * Break the data up into SOCKET_SEND_MAX chunks for sending...
489 * OS/2 seemed to complain when the chunks were too large.
491 #define SOCKET_SEND_MAX 65000
493 int write_len = 0, send_len, send_rc = 0, i = 0;
494 while ((i < len) && (send_rc != -1))
496 if ((i + SOCKET_SEND_MAX) > len)
499 send_len = SOCKET_SEND_MAX;
500 send_rc = send(fd,(char*)buf + i, send_len, 0);
508 return (write(fd, buf, len) != len);
514 /*********************************************************************
516 * Function : read_socket
518 * Description : Read from a TCP/IP socket in a platform independent way.
521 * 1 : fd = file descriptor of the socket to read
522 * 2 : buf = pointer to buffer where data will be written
523 * Must be >= len bytes long.
524 * 3 : len = maximum number of bytes to read
526 * Returns : On success, the number of bytes read is returned (zero
527 * indicates end of file), and the file position is advanced
528 * by this number. It is not an error if this number is
529 * smaller than the number of bytes requested; this may hap-
530 * pen for example because fewer bytes are actually available
531 * right now (maybe because we were close to end-of-file, or
532 * because we are reading from a pipe, or from a terminal,
533 * or because read() was interrupted by a signal). On error,
534 * -1 is returned, and errno is set appropriately. In this
535 * case it is left unspecified whether the file position (if
538 *********************************************************************/
539 int read_socket(jb_socket fd, char *buf, int len)
547 return(recv(fd, buf, len, 0));
548 #elif defined(__BEOS__) || defined(AMIGA) || defined(__OS2__)
549 return(recv(fd, buf, (size_t)len, 0));
551 return(read(fd, buf, (size_t)len));
556 /*********************************************************************
558 * Function : close_socket
560 * Description : Closes a TCP/IP socket
563 * 1 : fd = file descriptor of socket to be closed
567 *********************************************************************/
568 void close_socket(jb_socket fd)
570 #if defined(_WIN32) || defined(__BEOS__)
574 #elif defined(__OS2__)
583 /*********************************************************************
585 * Function : bind_port
587 * Description : Call socket, set socket options, and listen.
588 * Called by listen_loop to "boot up" our proxy address.
591 * 1 : hostnam = TCP/IP address to bind/listen to
592 * 2 : portnum = port to listen on
593 * 3 : pfd = pointer used to return file descriptor.
595 * Returns : if success, returns 0 and sets *pfd.
596 * if failure, returns -3 if address is in use,
597 * -2 if address unresolvable,
599 *********************************************************************/
600 int bind_port(const char *hostnam, int portnum, jb_socket *pfd)
602 struct sockaddr_in inaddr;
606 #endif /* ndef _WIN32 */
608 *pfd = JB_INVALID_SOCKET;
610 memset((char *)&inaddr, '\0', sizeof inaddr);
612 inaddr.sin_family = AF_INET;
613 inaddr.sin_addr.s_addr = resolve_hostname_to_ip(hostnam);
615 if (inaddr.sin_addr.s_addr == INADDR_NONE)
621 if (sizeof(inaddr.sin_port) == sizeof(short))
622 #endif /* ndef _WIN32 */
624 inaddr.sin_port = htons((unsigned short) portnum);
629 inaddr.sin_port = htonl((unsigned long) portnum);
631 #endif /* ndef _WIN32 */
633 fd = socket(AF_INET, SOCK_STREAM, 0);
636 if (fd == JB_INVALID_SOCKET)
646 * This is not needed for Win32 - in fact, it stops
647 * duplicate instances of Privoxy from being caught.
649 * On UNIX, we assume the user is sensible enough not
650 * to start Junkbuster multiple times on the same IP.
651 * Without this, stopping and restarting Privoxy
652 * from a script fails.
653 * Note: SO_REUSEADDR is meant to only take over
654 * sockets which are *not* in listen state in Linux,
655 * e.g. sockets in TIME_WAIT. YMMV.
657 setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char *)&one, sizeof(one));
658 #endif /* ndef _WIN32 */
660 if (bind(fd, (struct sockaddr *)&inaddr, sizeof(inaddr)) < 0)
663 errno = WSAGetLastError();
664 if (errno == WSAEADDRINUSE)
666 if (errno == EADDRINUSE)
679 while (listen(fd, 5) == -1)
693 /*********************************************************************
695 * Function : accept_connection
697 * Description : Accepts a connection on a socket. Socket must have
698 * been created using bind_port().
701 * 1 : csp = Client state, cfd, ip_addr_str, and
702 * ip_addr_long will be set by this routine.
703 * 2 : fd = file descriptor returned from bind_port
705 * Returns : when a connection is accepted, it returns 1 (TRUE).
706 * On an error it returns 0 (FALSE).
708 *********************************************************************/
709 int accept_connection(struct client_state * csp, jb_socket fd)
711 struct sockaddr_in client, server;
712 struct hostent *host = NULL;
714 #if defined(_WIN32) || defined(__OS2__) || defined(__APPLE_CC__) || defined(AMIGA)
715 /* Wierdness - fix a warning. */
716 int c_length, s_length;
718 socklen_t c_length, s_length;
720 #if defined(HAVE_GETHOSTBYADDR_R_8_ARGS) || defined(HAVE_GETHOSTBYADDR_R_7_ARGS) || defined(HAVE_GETHOSTBYADDR_R_5_ARGS)
721 struct hostent result;
722 #if defined(HAVE_GETHOSTBYADDR_R_5_ARGS)
723 struct hostent_data hdata;
725 char hbuf[HOSTENT_BUFFER_SIZE];
727 #endif /* def HAVE_GETHOSTBYADDR_R_5_ARGS */
728 #endif /* def HAVE_GETHOSTBYADDR_R_(8|7|5)_ARGS */
730 c_length = s_length = sizeof(client);
733 afd = accept (fd, (struct sockaddr *) &client, &c_length);
734 if (afd == JB_INVALID_SOCKET)
741 afd = accept (fd, (struct sockaddr *) &client, &c_length);
742 } while (afd < 1 && errno == EINTR);
750 * Determine the IP-Adress that the client used to reach us
751 * and the hostname associated with that address
753 if (!getsockname(afd, (struct sockaddr *) &server, &s_length))
755 csp->my_ip_addr_str = strdup(inet_ntoa(server.sin_addr));
756 #if defined(HAVE_GETHOSTBYADDR_R_8_ARGS)
757 gethostbyaddr_r((const char *)&server.sin_addr,
758 sizeof(server.sin_addr), AF_INET,
759 &result, hbuf, HOSTENT_BUFFER_SIZE,
761 #elif defined(HAVE_GETHOSTBYADDR_R_7_ARGS)
762 host = gethostbyaddr_r((const char *)&server.sin_addr,
763 sizeof(server.sin_addr), AF_INET,
764 &result, hbuf, HOSTENT_BUFFER_SIZE, &thd_err);
765 #elif defined(HAVE_GETHOSTBYADDR_R_5_ARGS)
766 if (0 == gethostbyaddr_r((const char *)&server.sin_addr,
767 sizeof(server.sin_addr), AF_INET,
776 #elif FEATURE_PTHREAD
777 pthread_mutex_lock(&resolver_mutex);
778 host = gethostbyaddr((const char *)&server.sin_addr,
779 sizeof(server.sin_addr), AF_INET);
780 pthread_mutex_unlock(&resolver_mutex);
782 host = gethostbyaddr((const char *)&server.sin_addr,
783 sizeof(server.sin_addr), AF_INET);
787 log_error(LOG_LEVEL_ERROR, "Unable to get my own hostname: %E\n");
791 csp->my_hostname = strdup(host->h_name);
796 csp->ip_addr_str = strdup(inet_ntoa(client.sin_addr));
797 csp->ip_addr_long = ntohl(client.sin_addr.s_addr);
804 /*********************************************************************
806 * Function : resolve_hostname_to_ip
808 * Description : Resolve a hostname to an internet tcp/ip address.
809 * NULL or an empty string resolve to INADDR_ANY.
812 * 1 : host = hostname to resolve
814 * Returns : INADDR_NONE => failure, INADDR_ANY or tcp/ip address if succesful.
816 *********************************************************************/
817 unsigned long resolve_hostname_to_ip(const char *host)
819 struct sockaddr_in inaddr;
820 struct hostent *hostp;
821 unsigned int dns_retries = 0;
822 #if defined(HAVE_GETHOSTBYNAME_R_6_ARGS) || defined(HAVE_GETHOSTBYNAME_R_5_ARGS) || defined(HAVE_GETHOSTBYNAME_R_3_ARGS)
823 struct hostent result;
824 #if defined(HAVE_GETHOSTBYNAME_R_6_ARGS) || defined(HAVE_GETHOSTBYNAME_R_5_ARGS)
825 char hbuf[HOSTENT_BUFFER_SIZE];
827 #else /* defined(HAVE_GETHOSTBYNAME_R_3_ARGS) */
828 struct hostent_data hdata;
829 #endif /* def HAVE_GETHOSTBYNAME_R_(6|5)_ARGS */
830 #endif /* def HAVE_GETHOSTBYNAME_R_(6|5|3)_ARGS */
832 if ((host == NULL) || (*host == '\0'))
837 memset((char *) &inaddr, 0, sizeof inaddr);
839 if ((inaddr.sin_addr.s_addr = inet_addr(host)) == -1)
841 #if defined(HAVE_GETHOSTBYNAME_R_6_ARGS)
842 while (gethostbyname_r(host, &result, hbuf,
843 HOSTENT_BUFFER_SIZE, &hostp, &thd_err)
844 && (thd_err == TRY_AGAIN) && (dns_retries++ < MAX_DNS_RETRIES))
846 log_error(LOG_LEVEL_ERROR,
847 "Timeout #%u while trying to resolve %s. Trying again.",
850 #elif defined(HAVE_GETHOSTBYNAME_R_5_ARGS)
851 while (NULL == (hostp = gethostbyname_r(host, &result,
852 hbuf, HOSTENT_BUFFER_SIZE, &thd_err))
853 && (thd_err == TRY_AGAIN) && (dns_retries++ < MAX_DNS_RETRIES))
855 log_error(LOG_LEVEL_ERROR,
856 "Timeout #%u while trying to resolve %s. Trying again.",
859 #elif defined(HAVE_GETHOSTBYNAME_R_3_ARGS)
861 * XXX: Doesn't retry in case of soft errors.
862 * Does this gethostbyname_r version set h_errno?
864 if (0 == gethostbyname_r(host, &result, &hdata))
872 #elif FEATURE_PTHREAD
873 pthread_mutex_lock(&resolver_mutex);
874 while (NULL == (hostp = gethostbyname(host))
875 && (h_errno == TRY_AGAIN) && (dns_retries++ < MAX_DNS_RETRIES))
877 log_error(LOG_LEVEL_ERROR,
878 "Timeout #%u while trying to resolve %s. Trying again.",
881 pthread_mutex_unlock(&resolver_mutex);
883 while (NULL == (hostp = gethostbyname(host))
884 && (h_errno == TRY_AGAIN) && (dns_retries++ < MAX_DNS_RETRIES))
886 log_error(LOG_LEVEL_ERROR,
887 "Timeout #%u while trying to resolve %s. Trying again.",
890 #endif /* def HAVE_GETHOSTBYNAME_R_(6|5|3)_ARGS */
892 * On Mac OSX, if a domain exists but doesn't have a type A
893 * record associated with it, the h_addr member of the struct
894 * hostent returned by gethostbyname is NULL, even if h_length
895 * is 4. Therefore the second test below.
897 if (hostp == NULL || hostp->h_addr == NULL)
900 log_error(LOG_LEVEL_ERROR, "could not resolve hostname %s", host);
903 if (hostp->h_addrtype != AF_INET)
906 errno = WSAEPROTOTYPE;
910 log_error(LOG_LEVEL_ERROR, "hostname %s resolves to unknown address type.", host);
914 (char *) &inaddr.sin_addr,
915 (char *) hostp->h_addr,
916 sizeof(inaddr.sin_addr)
919 return(inaddr.sin_addr.s_addr);