1 const char jbsockets_rcs[] = "$Id: jbsockets.c,v 1.41 2006/11/13 19:05:51 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 1.41 2006/11/13 19:05:51 fabiankeil
39 * Make pthread mutex locking more generic. Instead of
40 * checking for OSX and OpenBSD, check for FEATURE_PTHREAD
41 * and use mutex locking unless there is an _r function
42 * available. Better safe than sorry.
44 * Fixes "./configure --disable-pthread" and should result
45 * in less threading-related problems on pthread-using platforms,
46 * but it still doesn't fix BR#1122404.
48 * Revision 1.40 2006/09/02 15:36:42 fabiankeil
49 * Follow the OpenBSD port's lead and protect the resolve
50 * functions on OpenBSD as well.
52 * Revision 1.39 2006/08/03 02:46:41 david__schmidt
53 * Incorporate Fabian Keil's patch work:
\rhttp://www.fabiankeil.de/sourcecode/privoxy/
55 * Revision 1.38 2006/07/18 14:48:46 david__schmidt
56 * Reorganizing the repository: swapping out what was HEAD (the old 3.1 branch)
57 * with what was really the latest development (the v_3_0_branch branch)
59 * Revision 1.35.2.8 2006/01/21 16:16:08 david__schmidt
60 * Thanks to Edward Carrel for his patch to modernize OSX's
\rpthreads support. See bug #1409623.
62 * Revision 1.35.2.7 2005/05/07 21:50:55 david__schmidt
63 * A few memory leaks plugged (mostly on error paths)
65 * Revision 1.35.2.6 2003/12/17 16:34:40 oes
68 * Revision 1.35.2.5 2003/04/29 11:32:54 oes
69 * Don't rely on h_addr being non-NULL after gethostbyname.
70 * Works around an oddness in Max OSX and closes bug #724796
72 * Revision 1.35.2.4 2003/04/04 12:40:20 oes
73 * Made sure the errno set by bind, not close[socket] is used in
74 * bind_port. Probably fixes bugs #713777, #705562.
76 * Revision 1.35.2.3 2003/03/07 03:41:04 david__schmidt
77 * 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.
79 * Revision 1.35.2.2 2002/11/20 14:37:24 oes
80 * Fixed Win32 error logging in bind_port.
81 * Thanks to Oliver Stoeneberg for the hint.
83 * Revision 1.35.2.1 2002/05/26 23:41:27 joergs
84 * AmigaOS: Fixed wrong type of len in write_socket()
86 * Revision 1.35 2002/04/26 15:50:04 joergs
87 * AmigaOS: No socklen_t, added AMIGA to the systems using int instead.
89 * Revision 1.34 2002/04/08 20:31:41 swa
92 * Revision 1.33 2002/04/03 16:02:18 gliptak
93 * Correcting compile warning with older gcc
95 * Revision 1.32 2002/03/31 17:18:59 jongfoster
96 * Win32 only: Enabling STRICT to fix a VC++ compile warning.
98 * Revision 1.31 2002/03/29 03:33:13 david__schmidt
99 * Fix Mac OSX compiler warnings
101 * Revision 1.30 2002/03/27 14:32:43 david__schmidt
102 * More compiler warning message maintenance
104 * Revision 1.29 2002/03/26 22:29:54 swa
105 * we have a new homepage!
107 * Revision 1.28 2002/03/24 13:25:43 swa
108 * name change related issues
110 * Revision 1.27 2002/03/13 00:27:05 jongfoster
113 * Revision 1.26 2002/03/11 22:07:02 david__schmidt
114 * OS/2 port maintenance:
115 * - Fixed EMX build - it had decayed a little
116 * - Fixed inexplicable crash during FD_ZERO - must be due to a bad macro.
117 * substituted a memset for now.
119 * Revision 1.25 2002/03/09 20:03:52 jongfoster
120 * - Making various functions return int rather than size_t.
121 * (Undoing a recent change). Since size_t is unsigned on
122 * Windows, functions like read_socket that return -1 on
123 * error cannot return a size_t.
125 * THIS WAS A MAJOR BUG - it caused frequent, unpredictable
126 * crashes, and also frequently caused JB to jump to 100%
127 * CPU and stay there. (Because it thought it had just
128 * read ((unsigned)-1) == 4Gb of data...)
130 * - The signature of write_socket has changed, it now simply
131 * returns success=0/failure=nonzero.
133 * - Trying to get rid of a few warnings --with-debug on
134 * Windows, I've introduced a new type "jb_socket". This is
135 * used for the socket file descriptors. On Windows, this
136 * is SOCKET (a typedef for unsigned). Everywhere else, it's
137 * an int. The error value can't be -1 any more, so it's
138 * now JB_INVALID_SOCKET (which is -1 on UNIX, and in
139 * Windows it maps to the #define INVALID_SOCKET.)
141 * - The signature of bind_port has changed.
143 * Revision 1.24 2002/03/07 03:51:36 oes
144 * - Improved handling of failed DNS lookups
145 * - Fixed compiler warnings etc
147 * Revision 1.23 2002/03/05 00:36:01 jongfoster
148 * Fixing bug 514988 - unable to restart Junkbuster
150 * Revision 1.22 2002/03/04 02:08:02 david__schmidt
151 * Enable web editing of actions file on OS/2 (it had been broken all this time!)
153 * Revision 1.21 2002/01/09 14:32:33 oes
154 * Added support for gethostbyname_r and gethostbyaddr_r.
156 * Revision 1.20 2001/11/16 00:48:48 jongfoster
157 * Enabling duplicate-socket detection for all platforms, not
160 * Revision 1.19 2001/10/25 03:40:47 david__schmidt
161 * Change in porting tactics: OS/2's EMX porting layer doesn't allow multiple
162 * threads to call select() simultaneously. So, it's time to do a real, live,
163 * native OS/2 port. See defines for __EMX__ (the porting layer) vs. __OS2__
164 * (native). Both versions will work, but using __OS2__ offers multi-threading.
166 * Revision 1.18 2001/09/21 23:02:02 david__schmidt
167 * Cleaning up 2 compiler warnings on OS/2.
169 * Revision 1.17 2001/09/13 20:11:46 jongfoster
170 * Fixing 2 compiler warnings under Win32
172 * Revision 1.16 2001/07/30 22:08:36 jongfoster
173 * Tidying up #defines:
174 * - All feature #defines are now of the form FEATURE_xxx
175 * - Permanently turned off WIN_GUI_EDIT
176 * - Permanently turned on WEBDAV and SPLIT_PROXY_ARGS
178 * Revision 1.15 2001/07/29 17:40:43 jongfoster
179 * Fixed compiler warning by adding a cast
181 * Revision 1.14 2001/07/18 13:47:59 oes
182 * Eliminated dirty hack for getsockbyname()
184 * Revision 1.13 2001/07/15 13:56:57 jongfoster
185 * Removing unused local variable.
187 * Revision 1.12 2001/07/01 17:04:11 oes
188 * Bugfix: accept_connection no longer uses the obsolete hstrerror() function
190 * Revision 1.11 2001/06/29 21:45:41 oes
191 * Indentation, CRLF->LF, Tab-> Space
193 * Revision 1.10 2001/06/29 13:29:15 oes
194 * - Added remote (server) host IP to csp->http->host_ip_addr_str
195 * - Added detection of local socket IP and fqdn
196 * - Removed logentry from cancelled commit
198 * Revision 1.9 2001/06/07 23:06:09 jongfoster
199 * The host parameter to connect_to() is now const.
201 * Revision 1.8 2001/06/03 19:12:07 oes
204 * Revision 1.7 2001/05/28 16:14:00 jongfoster
205 * Fixing bug in LOG_LEVEL_LOG
207 * Revision 1.6 2001/05/26 17:28:32 jongfoster
208 * Fixed LOG_LEVEL_LOG
210 * Revision 1.5 2001/05/26 15:26:15 jongfoster
211 * ACL feature now provides more security by immediately dropping
212 * connections from untrusted hosts.
214 * Revision 1.4 2001/05/26 00:37:42 jongfoster
215 * Cosmetic indentation correction.
217 * Revision 1.3 2001/05/25 21:57:54 jongfoster
218 * Now gives a warning under Windows if you try to bind
219 * it to a port that's already in use.
221 * Revision 1.2 2001/05/17 23:01:01 oes
222 * - Cleaned CRLF's from the sources and related files
224 * Revision 1.1.1.1 2001/05/15 13:58:54 oes
225 * Initial import of version 2.9.3 source tree
228 *********************************************************************/
238 #include <sys/types.h>
246 #include <sys/timeb.h>
254 #include <sys/time.h>
255 #include <netinet/in.h>
256 #include <sys/ioctl.h>
258 #include <sys/socket.h>
261 #include <netinet/tcp.h>
263 #include <arpa/inet.h>
269 #if defined(__EMX__) || defined (__OS2__)
270 #include <sys/select.h> /* OS/2/EMX needs a little help with select */
280 #ifdef FEATURE_PTHREAD
282 /* jcc.h is for mutex semaphores only */
283 #endif /* def FEATURE_PTHREAD */
285 #include "jbsockets.h"
289 const char jbsockets_h_rcs[] = JBSOCKETS_H_VERSION;
292 * Maximum number of gethostbyname(_r) retries in case of
293 * soft errors (TRY_AGAIN).
294 * XXX: Does it make sense to make this a config option?
296 #define MAX_DNS_RETRIES 10
298 /*********************************************************************
300 * Function : connect_to
302 * Description : Open a socket and connect to it. Will check
303 * that this is allowed according to ACL.
306 * 1 : host = hostname to connect to
307 * 2 : portnum = port to connent on
308 * 3 : csp = Current client state (buffers, headers, etc...)
309 * Not modified, only used for source IP and ACL.
311 * Returns : JB_INVALID_SOCKET => failure, else it is the socket
314 *********************************************************************/
315 jb_socket connect_to(const char *host, int portnum, struct client_state *csp)
317 struct sockaddr_in inaddr;
321 struct timeval tv[1];
322 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA)
324 #endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) */
327 struct access_control_addr dst[1];
328 #endif /* def FEATURE_ACL */
330 memset((char *)&inaddr, 0, sizeof inaddr);
332 if ((addr = resolve_hostname_to_ip(host)) == INADDR_NONE)
334 csp->http->host_ip_addr_str = strdup("unknown");
335 return(JB_INVALID_SOCKET);
339 dst->addr = ntohl((unsigned long) addr);
342 if (block_acl(dst, csp))
349 return(JB_INVALID_SOCKET);
351 #endif /* def FEATURE_ACL */
353 inaddr.sin_addr.s_addr = addr;
354 inaddr.sin_family = AF_INET;
355 csp->http->host_ip_addr_str = strdup(inet_ntoa(inaddr.sin_addr));
358 if (sizeof(inaddr.sin_port) == sizeof(short))
359 #endif /* ndef _WIN32 */
361 inaddr.sin_port = htons((unsigned short) portnum);
366 inaddr.sin_port = htonl((unsigned long)portnum);
368 #endif /* ndef _WIN32 */
371 if ((fd = socket(inaddr.sin_family, SOCK_STREAM, 0)) == JB_INVALID_SOCKET)
373 if ((fd = socket(inaddr.sin_family, SOCK_STREAM, 0)) < 0)
376 return(JB_INVALID_SOCKET);
380 { /* turn off TCP coalescence */
382 setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, (char *) &mi, sizeof (int));
384 #endif /* def TCP_NODELAY */
386 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
387 if ((flags = fcntl(fd, F_GETFL, 0)) != -1)
390 fcntl(fd, F_SETFL, flags);
392 #endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__) */
394 while (connect(fd, (struct sockaddr *) & inaddr, sizeof inaddr) == JB_INVALID_SOCKET)
397 if (errno == WSAEINPROGRESS)
399 if (sock_errno() == EINPROGRESS)
400 #else /* ifndef _WIN32 */
401 if (errno == EINPROGRESS)
402 #endif /* ndef _WIN32 || __OS2__ */
408 if (sock_errno() != EINTR)
414 return(JB_INVALID_SOCKET);
418 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
422 fcntl(fd, F_SETFL, flags);
424 #endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__) */
426 /* wait for connection to complete */
433 /* MS Windows uses int, not SOCKET, for the 1st arg of select(). Wierd! */
434 if (select((int)fd + 1, NULL, &wfds, NULL, tv) <= 0)
437 return(JB_INVALID_SOCKET);
444 /*********************************************************************
446 * Function : write_socket
448 * Description : Write the contents of buf (for n bytes) to socket fd.
451 * 1 : fd = file descriptor (aka. handle) of socket to write to.
452 * 2 : buf = pointer to data to be written.
453 * 3 : len = length of data to be written to the socket "fd".
455 * Returns : 0 on success (entire buffer sent).
458 *********************************************************************/
460 int write_socket(jb_socket fd, const char *buf, ssize_t len)
462 int write_socket(jb_socket fd, const char *buf, size_t len)
470 if (len < 0) /* constant condition - size_t isn't ever negative */
475 log_error(LOG_LEVEL_LOG, "%N", len, buf);
478 return (send(fd, buf, (int)len, 0) != (int)len);
479 #elif defined(__BEOS__) || defined(AMIGA)
480 return (send(fd, buf, len, 0) != len);
481 #elif defined(__OS2__)
483 * Break the data up into SOCKET_SEND_MAX chunks for sending...
484 * OS/2 seemed to complain when the chunks were too large.
486 #define SOCKET_SEND_MAX 65000
488 int write_len = 0, send_len, send_rc = 0, i = 0;
489 while ((i < len) && (send_rc != -1))
491 if ((i + SOCKET_SEND_MAX) > len)
494 send_len = SOCKET_SEND_MAX;
495 send_rc = send(fd,(char*)buf + i, send_len, 0);
503 return (write(fd, buf, len) != len);
509 /*********************************************************************
511 * Function : read_socket
513 * Description : Read from a TCP/IP socket in a platform independent way.
516 * 1 : fd = file descriptor of the socket to read
517 * 2 : buf = pointer to buffer where data will be written
518 * Must be >= len bytes long.
519 * 3 : len = maximum number of bytes to read
521 * Returns : On success, the number of bytes read is returned (zero
522 * indicates end of file), and the file position is advanced
523 * by this number. It is not an error if this number is
524 * smaller than the number of bytes requested; this may hap-
525 * pen for example because fewer bytes are actually available
526 * right now (maybe because we were close to end-of-file, or
527 * because we are reading from a pipe, or from a terminal,
528 * or because read() was interrupted by a signal). On error,
529 * -1 is returned, and errno is set appropriately. In this
530 * case it is left unspecified whether the file position (if
533 *********************************************************************/
534 int read_socket(jb_socket fd, char *buf, int len)
542 return(recv(fd, buf, len, 0));
543 #elif defined(__BEOS__) || defined(AMIGA) || defined(__OS2__)
544 return(recv(fd, buf, (size_t)len, 0));
546 return(read(fd, buf, (size_t)len));
551 /*********************************************************************
553 * Function : close_socket
555 * Description : Closes a TCP/IP socket
558 * 1 : fd = file descriptor of socket to be closed
562 *********************************************************************/
563 void close_socket(jb_socket fd)
565 #if defined(_WIN32) || defined(__BEOS__)
569 #elif defined(__OS2__)
578 /*********************************************************************
580 * Function : bind_port
582 * Description : Call socket, set socket options, and listen.
583 * Called by listen_loop to "boot up" our proxy address.
586 * 1 : hostnam = TCP/IP address to bind/listen to
587 * 2 : portnum = port to listen on
588 * 3 : pfd = pointer used to return file descriptor.
590 * Returns : if success, returns 0 and sets *pfd.
591 * if failure, returns -3 if address is in use,
592 * -2 if address unresolvable,
594 *********************************************************************/
595 int bind_port(const char *hostnam, int portnum, jb_socket *pfd)
597 struct sockaddr_in inaddr;
601 #endif /* ndef _WIN32 */
603 *pfd = JB_INVALID_SOCKET;
605 memset((char *)&inaddr, '\0', sizeof inaddr);
607 inaddr.sin_family = AF_INET;
608 inaddr.sin_addr.s_addr = resolve_hostname_to_ip(hostnam);
610 if (inaddr.sin_addr.s_addr == INADDR_NONE)
616 if (sizeof(inaddr.sin_port) == sizeof(short))
617 #endif /* ndef _WIN32 */
619 inaddr.sin_port = htons((unsigned short) portnum);
624 inaddr.sin_port = htonl((unsigned long) portnum);
626 #endif /* ndef _WIN32 */
628 fd = socket(AF_INET, SOCK_STREAM, 0);
631 if (fd == JB_INVALID_SOCKET)
641 * This is not needed for Win32 - in fact, it stops
642 * duplicate instances of Privoxy from being caught.
644 * On UNIX, we assume the user is sensible enough not
645 * to start Junkbuster multiple times on the same IP.
646 * Without this, stopping and restarting Privoxy
647 * from a script fails.
648 * Note: SO_REUSEADDR is meant to only take over
649 * sockets which are *not* in listen state in Linux,
650 * e.g. sockets in TIME_WAIT. YMMV.
652 setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char *)&one, sizeof(one));
653 #endif /* ndef _WIN32 */
655 if (bind(fd, (struct sockaddr *)&inaddr, sizeof(inaddr)) < 0)
658 errno = WSAGetLastError();
659 if (errno == WSAEADDRINUSE)
661 if (errno == EADDRINUSE)
674 while (listen(fd, 5) == -1)
688 /*********************************************************************
690 * Function : accept_connection
692 * Description : Accepts a connection on a socket. Socket must have
693 * been created using bind_port().
696 * 1 : csp = Client state, cfd, ip_addr_str, and
697 * ip_addr_long will be set by this routine.
698 * 2 : fd = file descriptor returned from bind_port
700 * Returns : when a connection is accepted, it returns 1 (TRUE).
701 * On an error it returns 0 (FALSE).
703 *********************************************************************/
704 int accept_connection(struct client_state * csp, jb_socket fd)
706 struct sockaddr_in client, server;
707 struct hostent *host = NULL;
709 #if defined(_WIN32) || defined(__OS2__) || defined(__APPLE_CC__) || defined(AMIGA)
710 /* Wierdness - fix a warning. */
711 int c_length, s_length;
713 socklen_t c_length, s_length;
715 #if defined(HAVE_GETHOSTBYADDR_R_8_ARGS) || defined(HAVE_GETHOSTBYADDR_R_7_ARGS) || defined(HAVE_GETHOSTBYADDR_R_5_ARGS)
716 struct hostent result;
717 #if defined(HAVE_GETHOSTBYADDR_R_5_ARGS)
718 struct hostent_data hdata;
720 char hbuf[HOSTENT_BUFFER_SIZE];
722 #endif /* def HAVE_GETHOSTBYADDR_R_5_ARGS */
723 #endif /* def HAVE_GETHOSTBYADDR_R_(8|7|5)_ARGS */
725 c_length = s_length = sizeof(client);
728 afd = accept (fd, (struct sockaddr *) &client, &c_length);
729 if (afd == JB_INVALID_SOCKET)
736 afd = accept (fd, (struct sockaddr *) &client, &c_length);
737 } while (afd < 1 && errno == EINTR);
745 * Determine the IP-Adress that the client used to reach us
746 * and the hostname associated with that address
748 if (!getsockname(afd, (struct sockaddr *) &server, &s_length))
750 csp->my_ip_addr_str = strdup(inet_ntoa(server.sin_addr));
751 #if defined(HAVE_GETHOSTBYADDR_R_8_ARGS)
752 gethostbyaddr_r((const char *)&server.sin_addr,
753 sizeof(server.sin_addr), AF_INET,
754 &result, hbuf, HOSTENT_BUFFER_SIZE,
756 #elif defined(HAVE_GETHOSTBYADDR_R_7_ARGS)
757 host = gethostbyaddr_r((const char *)&server.sin_addr,
758 sizeof(server.sin_addr), AF_INET,
759 &result, hbuf, HOSTENT_BUFFER_SIZE, &thd_err);
760 #elif defined(HAVE_GETHOSTBYADDR_R_5_ARGS)
761 if (0 == gethostbyaddr_r((const char *)&server.sin_addr,
762 sizeof(server.sin_addr), AF_INET,
771 #elif FEATURE_PTHREAD
772 pthread_mutex_lock(&gethostbyaddr_mutex);
773 host = gethostbyaddr((const char *)&server.sin_addr,
774 sizeof(server.sin_addr), AF_INET);
775 pthread_mutex_unlock(&gethostbyaddr_mutex);
777 host = gethostbyaddr((const char *)&server.sin_addr,
778 sizeof(server.sin_addr), AF_INET);
782 log_error(LOG_LEVEL_ERROR, "Unable to get my own hostname: %E\n");
786 csp->my_hostname = strdup(host->h_name);
791 csp->ip_addr_str = strdup(inet_ntoa(client.sin_addr));
792 csp->ip_addr_long = ntohl(client.sin_addr.s_addr);
799 /*********************************************************************
801 * Function : resolve_hostname_to_ip
803 * Description : Resolve a hostname to an internet tcp/ip address.
804 * NULL or an empty string resolve to INADDR_ANY.
807 * 1 : host = hostname to resolve
809 * Returns : INADDR_NONE => failure, INADDR_ANY or tcp/ip address if succesful.
811 *********************************************************************/
812 unsigned long resolve_hostname_to_ip(const char *host)
814 struct sockaddr_in inaddr;
815 struct hostent *hostp;
816 unsigned int dns_retries = 0;
817 #if defined(HAVE_GETHOSTBYNAME_R_6_ARGS) || defined(HAVE_GETHOSTBYNAME_R_5_ARGS) || defined(HAVE_GETHOSTBYNAME_R_3_ARGS)
818 struct hostent result;
819 #if defined(HAVE_GETHOSTBYNAME_R_6_ARGS) || defined(HAVE_GETHOSTBYNAME_R_5_ARGS)
820 char hbuf[HOSTENT_BUFFER_SIZE];
822 #else /* defined(HAVE_GETHOSTBYNAME_R_3_ARGS) */
823 struct hostent_data hdata;
824 #endif /* def HAVE_GETHOSTBYNAME_R_(6|5)_ARGS */
825 #endif /* def HAVE_GETHOSTBYNAME_R_(6|5|3)_ARGS */
827 if ((host == NULL) || (*host == '\0'))
832 memset((char *) &inaddr, 0, sizeof inaddr);
834 if ((inaddr.sin_addr.s_addr = inet_addr(host)) == -1)
836 #if defined(HAVE_GETHOSTBYNAME_R_6_ARGS)
837 while (gethostbyname_r(host, &result, hbuf,
838 HOSTENT_BUFFER_SIZE, &hostp, &thd_err)
839 && (thd_err == TRY_AGAIN) && (dns_retries++ < MAX_DNS_RETRIES))
841 log_error(LOG_LEVEL_ERROR,
842 "Timeout #%u while trying to resolve %s. Trying again.",
845 #elif defined(HAVE_GETHOSTBYNAME_R_5_ARGS)
846 while (NULL == (hostp = gethostbyname_r(host, &result,
847 hbuf, HOSTENT_BUFFER_SIZE, &thd_err))
848 && (thd_err == TRY_AGAIN) && (dns_retries++ < MAX_DNS_RETRIES))
850 log_error(LOG_LEVEL_ERROR,
851 "Timeout #%u while trying to resolve %s. Trying again.",
854 #elif defined(HAVE_GETHOSTBYNAME_R_3_ARGS)
856 * XXX: Doesn't retry in case of soft errors.
857 * Does this gethostbyname_r version set h_errno?
859 if (0 == gethostbyname_r(host, &result, &hdata))
867 #elif FEATURE_PTHREAD
868 pthread_mutex_lock(&gethostbyname_mutex);
869 while (NULL == (hostp = gethostbyname(host))
870 && (h_errno == TRY_AGAIN) && (dns_retries++ < MAX_DNS_RETRIES))
872 log_error(LOG_LEVEL_ERROR,
873 "Timeout #%u while trying to resolve %s. Trying again.",
876 pthread_mutex_unlock(&gethostbyname_mutex);
878 while (NULL == (hostp = gethostbyname(host))
879 && (h_errno == TRY_AGAIN) && (dns_retries++ < MAX_DNS_RETRIES))
881 log_error(LOG_LEVEL_ERROR,
882 "Timeout #%u while trying to resolve %s. Trying again.",
885 #endif /* def HAVE_GETHOSTBYNAME_R_(6|5|3)_ARGS */
887 * On Mac OSX, if a domain exists but doesn't have a type A
888 * record associated with it, the h_addr member of the struct
889 * hostent returned by gethostbyname is NULL, even if h_length
890 * is 4. Therefore the second test below.
892 if (hostp == NULL || hostp->h_addr == NULL)
895 log_error(LOG_LEVEL_ERROR, "could not resolve hostname %s", host);
898 if (hostp->h_addrtype != AF_INET)
901 errno = WSAEPROTOTYPE;
905 log_error(LOG_LEVEL_ERROR, "hostname %s resolves to unknown address type.", host);
909 (char *) &inaddr.sin_addr,
910 (char *) hostp->h_addr,
911 sizeof(inaddr.sin_addr)
914 return(inaddr.sin_addr.s_addr);