1 const char jbsockets_rcs[] = "$Id: jbsockets.c,v 1.40 2006/09/02 15:36:42 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 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 1.40 2006/09/02 15:36:42 fabiankeil
39 * Follow the OpenBSD port's lead and protect the resolve
40 * functions on OpenBSD as well.
42 * Revision 1.39 2006/08/03 02:46:41 david__schmidt
43 * Incorporate Fabian Keil's patch work:
\rhttp://www.fabiankeil.de/sourcecode/privoxy/
45 * Revision 1.38 2006/07/18 14:48:46 david__schmidt
46 * Reorganizing the repository: swapping out what was HEAD (the old 3.1 branch)
47 * with what was really the latest development (the v_3_0_branch branch)
49 * Revision 1.35.2.8 2006/01/21 16:16:08 david__schmidt
50 * Thanks to Edward Carrel for his patch to modernize OSX's
\rpthreads support. See bug #1409623.
52 * Revision 1.35.2.7 2005/05/07 21:50:55 david__schmidt
53 * A few memory leaks plugged (mostly on error paths)
55 * Revision 1.35.2.6 2003/12/17 16:34:40 oes
58 * Revision 1.35.2.5 2003/04/29 11:32:54 oes
59 * Don't rely on h_addr being non-NULL after gethostbyname.
60 * Works around an oddness in Max OSX and closes bug #724796
62 * Revision 1.35.2.4 2003/04/04 12:40:20 oes
63 * Made sure the errno set by bind, not close[socket] is used in
64 * bind_port. Probably fixes bugs #713777, #705562.
66 * Revision 1.35.2.3 2003/03/07 03:41:04 david__schmidt
67 * 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.
69 * Revision 1.35.2.2 2002/11/20 14:37:24 oes
70 * Fixed Win32 error logging in bind_port.
71 * Thanks to Oliver Stoeneberg for the hint.
73 * Revision 1.35.2.1 2002/05/26 23:41:27 joergs
74 * AmigaOS: Fixed wrong type of len in write_socket()
76 * Revision 1.35 2002/04/26 15:50:04 joergs
77 * AmigaOS: No socklen_t, added AMIGA to the systems using int instead.
79 * Revision 1.34 2002/04/08 20:31:41 swa
82 * Revision 1.33 2002/04/03 16:02:18 gliptak
83 * Correcting compile warning with older gcc
85 * Revision 1.32 2002/03/31 17:18:59 jongfoster
86 * Win32 only: Enabling STRICT to fix a VC++ compile warning.
88 * Revision 1.31 2002/03/29 03:33:13 david__schmidt
89 * Fix Mac OSX compiler warnings
91 * Revision 1.30 2002/03/27 14:32:43 david__schmidt
92 * More compiler warning message maintenance
94 * Revision 1.29 2002/03/26 22:29:54 swa
95 * we have a new homepage!
97 * Revision 1.28 2002/03/24 13:25:43 swa
98 * name change related issues
100 * Revision 1.27 2002/03/13 00:27:05 jongfoster
103 * Revision 1.26 2002/03/11 22:07:02 david__schmidt
104 * OS/2 port maintenance:
105 * - Fixed EMX build - it had decayed a little
106 * - Fixed inexplicable crash during FD_ZERO - must be due to a bad macro.
107 * substituted a memset for now.
109 * Revision 1.25 2002/03/09 20:03:52 jongfoster
110 * - Making various functions return int rather than size_t.
111 * (Undoing a recent change). Since size_t is unsigned on
112 * Windows, functions like read_socket that return -1 on
113 * error cannot return a size_t.
115 * THIS WAS A MAJOR BUG - it caused frequent, unpredictable
116 * crashes, and also frequently caused JB to jump to 100%
117 * CPU and stay there. (Because it thought it had just
118 * read ((unsigned)-1) == 4Gb of data...)
120 * - The signature of write_socket has changed, it now simply
121 * returns success=0/failure=nonzero.
123 * - Trying to get rid of a few warnings --with-debug on
124 * Windows, I've introduced a new type "jb_socket". This is
125 * used for the socket file descriptors. On Windows, this
126 * is SOCKET (a typedef for unsigned). Everywhere else, it's
127 * an int. The error value can't be -1 any more, so it's
128 * now JB_INVALID_SOCKET (which is -1 on UNIX, and in
129 * Windows it maps to the #define INVALID_SOCKET.)
131 * - The signature of bind_port has changed.
133 * Revision 1.24 2002/03/07 03:51:36 oes
134 * - Improved handling of failed DNS lookups
135 * - Fixed compiler warnings etc
137 * Revision 1.23 2002/03/05 00:36:01 jongfoster
138 * Fixing bug 514988 - unable to restart Junkbuster
140 * Revision 1.22 2002/03/04 02:08:02 david__schmidt
141 * Enable web editing of actions file on OS/2 (it had been broken all this time!)
143 * Revision 1.21 2002/01/09 14:32:33 oes
144 * Added support for gethostbyname_r and gethostbyaddr_r.
146 * Revision 1.20 2001/11/16 00:48:48 jongfoster
147 * Enabling duplicate-socket detection for all platforms, not
150 * Revision 1.19 2001/10/25 03:40:47 david__schmidt
151 * Change in porting tactics: OS/2's EMX porting layer doesn't allow multiple
152 * threads to call select() simultaneously. So, it's time to do a real, live,
153 * native OS/2 port. See defines for __EMX__ (the porting layer) vs. __OS2__
154 * (native). Both versions will work, but using __OS2__ offers multi-threading.
156 * Revision 1.18 2001/09/21 23:02:02 david__schmidt
157 * Cleaning up 2 compiler warnings on OS/2.
159 * Revision 1.17 2001/09/13 20:11:46 jongfoster
160 * Fixing 2 compiler warnings under Win32
162 * Revision 1.16 2001/07/30 22:08:36 jongfoster
163 * Tidying up #defines:
164 * - All feature #defines are now of the form FEATURE_xxx
165 * - Permanently turned off WIN_GUI_EDIT
166 * - Permanently turned on WEBDAV and SPLIT_PROXY_ARGS
168 * Revision 1.15 2001/07/29 17:40:43 jongfoster
169 * Fixed compiler warning by adding a cast
171 * Revision 1.14 2001/07/18 13:47:59 oes
172 * Eliminated dirty hack for getsockbyname()
174 * Revision 1.13 2001/07/15 13:56:57 jongfoster
175 * Removing unused local variable.
177 * Revision 1.12 2001/07/01 17:04:11 oes
178 * Bugfix: accept_connection no longer uses the obsolete hstrerror() function
180 * Revision 1.11 2001/06/29 21:45:41 oes
181 * Indentation, CRLF->LF, Tab-> Space
183 * Revision 1.10 2001/06/29 13:29:15 oes
184 * - Added remote (server) host IP to csp->http->host_ip_addr_str
185 * - Added detection of local socket IP and fqdn
186 * - Removed logentry from cancelled commit
188 * Revision 1.9 2001/06/07 23:06:09 jongfoster
189 * The host parameter to connect_to() is now const.
191 * Revision 1.8 2001/06/03 19:12:07 oes
194 * Revision 1.7 2001/05/28 16:14:00 jongfoster
195 * Fixing bug in LOG_LEVEL_LOG
197 * Revision 1.6 2001/05/26 17:28:32 jongfoster
198 * Fixed LOG_LEVEL_LOG
200 * Revision 1.5 2001/05/26 15:26:15 jongfoster
201 * ACL feature now provides more security by immediately dropping
202 * connections from untrusted hosts.
204 * Revision 1.4 2001/05/26 00:37:42 jongfoster
205 * Cosmetic indentation correction.
207 * Revision 1.3 2001/05/25 21:57:54 jongfoster
208 * Now gives a warning under Windows if you try to bind
209 * it to a port that's already in use.
211 * Revision 1.2 2001/05/17 23:01:01 oes
212 * - Cleaned CRLF's from the sources and related files
214 * Revision 1.1.1.1 2001/05/15 13:58:54 oes
215 * Initial import of version 2.9.3 source tree
218 *********************************************************************/
228 #include <sys/types.h>
236 #include <sys/timeb.h>
244 #include <sys/time.h>
245 #include <netinet/in.h>
246 #include <sys/ioctl.h>
248 #include <sys/socket.h>
251 #include <netinet/tcp.h>
253 #include <arpa/inet.h>
259 #if defined(__EMX__) || defined (__OS2__)
260 #include <sys/select.h> /* OS/2/EMX needs a little help with select */
270 #ifdef FEATURE_PTHREAD
272 /* jcc.h is for mutex semaphores only */
273 #endif /* def FEATURE_PTHREAD */
275 #include "jbsockets.h"
279 const char jbsockets_h_rcs[] = JBSOCKETS_H_VERSION;
282 /*********************************************************************
284 * Function : connect_to
286 * Description : Open a socket and connect to it. Will check
287 * that this is allowed according to ACL.
290 * 1 : host = hostname to connect to
291 * 2 : portnum = port to connent on
292 * 3 : csp = Current client state (buffers, headers, etc...)
293 * Not modified, only used for source IP and ACL.
295 * Returns : JB_INVALID_SOCKET => failure, else it is the socket
298 *********************************************************************/
299 jb_socket connect_to(const char *host, int portnum, struct client_state *csp)
301 struct sockaddr_in inaddr;
305 struct timeval tv[1];
306 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA)
308 #endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) */
311 struct access_control_addr dst[1];
312 #endif /* def FEATURE_ACL */
314 memset((char *)&inaddr, 0, sizeof inaddr);
316 if ((addr = resolve_hostname_to_ip(host)) == INADDR_NONE)
318 csp->http->host_ip_addr_str = strdup("unknown");
319 return(JB_INVALID_SOCKET);
323 dst->addr = ntohl((unsigned long) addr);
326 if (block_acl(dst, csp))
333 return(JB_INVALID_SOCKET);
335 #endif /* def FEATURE_ACL */
337 inaddr.sin_addr.s_addr = addr;
338 inaddr.sin_family = AF_INET;
339 csp->http->host_ip_addr_str = strdup(inet_ntoa(inaddr.sin_addr));
342 if (sizeof(inaddr.sin_port) == sizeof(short))
343 #endif /* ndef _WIN32 */
345 inaddr.sin_port = htons((unsigned short) portnum);
350 inaddr.sin_port = htonl((unsigned long)portnum);
352 #endif /* ndef _WIN32 */
355 if ((fd = socket(inaddr.sin_family, SOCK_STREAM, 0)) == JB_INVALID_SOCKET)
357 if ((fd = socket(inaddr.sin_family, SOCK_STREAM, 0)) < 0)
360 return(JB_INVALID_SOCKET);
364 { /* turn off TCP coalescence */
366 setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, (char *) &mi, sizeof (int));
368 #endif /* def TCP_NODELAY */
370 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
371 if ((flags = fcntl(fd, F_GETFL, 0)) != -1)
374 fcntl(fd, F_SETFL, flags);
376 #endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__) */
378 while (connect(fd, (struct sockaddr *) & inaddr, sizeof inaddr) == JB_INVALID_SOCKET)
381 if (errno == WSAEINPROGRESS)
383 if (sock_errno() == EINPROGRESS)
384 #else /* ifndef _WIN32 */
385 if (errno == EINPROGRESS)
386 #endif /* ndef _WIN32 || __OS2__ */
392 if (sock_errno() != EINTR)
398 return(JB_INVALID_SOCKET);
402 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
406 fcntl(fd, F_SETFL, flags);
408 #endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__) */
410 /* wait for connection to complete */
417 /* MS Windows uses int, not SOCKET, for the 1st arg of select(). Wierd! */
418 if (select((int)fd + 1, NULL, &wfds, NULL, tv) <= 0)
421 return(JB_INVALID_SOCKET);
428 /*********************************************************************
430 * Function : write_socket
432 * Description : Write the contents of buf (for n bytes) to socket fd.
435 * 1 : fd = file descriptor (aka. handle) of socket to write to.
436 * 2 : buf = pointer to data to be written.
437 * 3 : len = length of data to be written to the socket "fd".
439 * Returns : 0 on success (entire buffer sent).
442 *********************************************************************/
444 int write_socket(jb_socket fd, const char *buf, ssize_t len)
446 int write_socket(jb_socket fd, const char *buf, size_t len)
454 if (len < 0) /* constant condition - size_t isn't ever negative */
459 log_error(LOG_LEVEL_LOG, "%N", len, buf);
462 return (send(fd, buf, (int)len, 0) != (int)len);
463 #elif defined(__BEOS__) || defined(AMIGA)
464 return (send(fd, buf, len, 0) != len);
465 #elif defined(__OS2__)
467 * Break the data up into SOCKET_SEND_MAX chunks for sending...
468 * OS/2 seemed to complain when the chunks were too large.
470 #define SOCKET_SEND_MAX 65000
472 int write_len = 0, send_len, send_rc = 0, i = 0;
473 while ((i < len) && (send_rc != -1))
475 if ((i + SOCKET_SEND_MAX) > len)
478 send_len = SOCKET_SEND_MAX;
479 send_rc = send(fd,(char*)buf + i, send_len, 0);
487 return (write(fd, buf, len) != len);
493 /*********************************************************************
495 * Function : read_socket
497 * Description : Read from a TCP/IP socket in a platform independent way.
500 * 1 : fd = file descriptor of the socket to read
501 * 2 : buf = pointer to buffer where data will be written
502 * Must be >= len bytes long.
503 * 3 : len = maximum number of bytes to read
505 * Returns : On success, the number of bytes read is returned (zero
506 * indicates end of file), and the file position is advanced
507 * by this number. It is not an error if this number is
508 * smaller than the number of bytes requested; this may hap-
509 * pen for example because fewer bytes are actually available
510 * right now (maybe because we were close to end-of-file, or
511 * because we are reading from a pipe, or from a terminal,
512 * or because read() was interrupted by a signal). On error,
513 * -1 is returned, and errno is set appropriately. In this
514 * case it is left unspecified whether the file position (if
517 *********************************************************************/
518 int read_socket(jb_socket fd, char *buf, int len)
526 return(recv(fd, buf, len, 0));
527 #elif defined(__BEOS__) || defined(AMIGA) || defined(__OS2__)
528 return(recv(fd, buf, (size_t)len, 0));
530 return(read(fd, buf, (size_t)len));
535 /*********************************************************************
537 * Function : close_socket
539 * Description : Closes a TCP/IP socket
542 * 1 : fd = file descriptor of socket to be closed
546 *********************************************************************/
547 void close_socket(jb_socket fd)
549 #if defined(_WIN32) || defined(__BEOS__)
553 #elif defined(__OS2__)
562 /*********************************************************************
564 * Function : bind_port
566 * Description : Call socket, set socket options, and listen.
567 * Called by listen_loop to "boot up" our proxy address.
570 * 1 : hostnam = TCP/IP address to bind/listen to
571 * 2 : portnum = port to listen on
572 * 3 : pfd = pointer used to return file descriptor.
574 * Returns : if success, returns 0 and sets *pfd.
575 * if failure, returns -3 if address is in use,
576 * -2 if address unresolvable,
578 *********************************************************************/
579 int bind_port(const char *hostnam, int portnum, jb_socket *pfd)
581 struct sockaddr_in inaddr;
585 #endif /* ndef _WIN32 */
587 *pfd = JB_INVALID_SOCKET;
589 memset((char *)&inaddr, '\0', sizeof inaddr);
591 inaddr.sin_family = AF_INET;
592 inaddr.sin_addr.s_addr = resolve_hostname_to_ip(hostnam);
594 if (inaddr.sin_addr.s_addr == INADDR_NONE)
600 if (sizeof(inaddr.sin_port) == sizeof(short))
601 #endif /* ndef _WIN32 */
603 inaddr.sin_port = htons((unsigned short) portnum);
608 inaddr.sin_port = htonl((unsigned long) portnum);
610 #endif /* ndef _WIN32 */
612 fd = socket(AF_INET, SOCK_STREAM, 0);
615 if (fd == JB_INVALID_SOCKET)
625 * This is not needed for Win32 - in fact, it stops
626 * duplicate instances of Privoxy from being caught.
628 * On UNIX, we assume the user is sensible enough not
629 * to start Junkbuster multiple times on the same IP.
630 * Without this, stopping and restarting Privoxy
631 * from a script fails.
632 * Note: SO_REUSEADDR is meant to only take over
633 * sockets which are *not* in listen state in Linux,
634 * e.g. sockets in TIME_WAIT. YMMV.
636 setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char *)&one, sizeof(one));
637 #endif /* ndef _WIN32 */
639 if (bind(fd, (struct sockaddr *)&inaddr, sizeof(inaddr)) < 0)
642 errno = WSAGetLastError();
643 if (errno == WSAEADDRINUSE)
645 if (errno == EADDRINUSE)
658 while (listen(fd, 5) == -1)
672 /*********************************************************************
674 * Function : accept_connection
676 * Description : Accepts a connection on a socket. Socket must have
677 * been created using bind_port().
680 * 1 : csp = Client state, cfd, ip_addr_str, and
681 * ip_addr_long will be set by this routine.
682 * 2 : fd = file descriptor returned from bind_port
684 * Returns : when a connection is accepted, it returns 1 (TRUE).
685 * On an error it returns 0 (FALSE).
687 *********************************************************************/
688 int accept_connection(struct client_state * csp, jb_socket fd)
690 struct sockaddr_in client, server;
691 struct hostent *host = NULL;
693 #if defined(_WIN32) || defined(__OS2__) || defined(__APPLE_CC__) || defined(AMIGA)
694 /* Wierdness - fix a warning. */
695 int c_length, s_length;
697 socklen_t c_length, s_length;
699 #if defined(HAVE_GETHOSTBYADDR_R_8_ARGS) || defined(HAVE_GETHOSTBYADDR_R_7_ARGS) || defined(HAVE_GETHOSTBYADDR_R_5_ARGS)
700 struct hostent result;
701 #if defined(HAVE_GETHOSTBYADDR_R_5_ARGS)
702 struct hostent_data hdata;
704 char hbuf[HOSTENT_BUFFER_SIZE];
706 #endif /* def HAVE_GETHOSTBYADDR_R_5_ARGS */
707 #endif /* def HAVE_GETHOSTBYADDR_R_(8|7|5)_ARGS */
709 c_length = s_length = sizeof(client);
712 afd = accept (fd, (struct sockaddr *) &client, &c_length);
713 if (afd == JB_INVALID_SOCKET)
720 afd = accept (fd, (struct sockaddr *) &client, &c_length);
721 } while (afd < 1 && errno == EINTR);
729 * Determine the IP-Adress that the client used to reach us
730 * and the hostname associated with that address
732 if (!getsockname(afd, (struct sockaddr *) &server, &s_length))
734 csp->my_ip_addr_str = strdup(inet_ntoa(server.sin_addr));
735 #if defined(HAVE_GETHOSTBYADDR_R_8_ARGS)
736 gethostbyaddr_r((const char *)&server.sin_addr,
737 sizeof(server.sin_addr), AF_INET,
738 &result, hbuf, HOSTENT_BUFFER_SIZE,
740 #elif defined(HAVE_GETHOSTBYADDR_R_7_ARGS)
741 host = gethostbyaddr_r((const char *)&server.sin_addr,
742 sizeof(server.sin_addr), AF_INET,
743 &result, hbuf, HOSTENT_BUFFER_SIZE, &thd_err);
744 #elif defined(HAVE_GETHOSTBYADDR_R_5_ARGS)
745 if (0 == gethostbyaddr_r((const char *)&server.sin_addr,
746 sizeof(server.sin_addr), AF_INET,
755 #elif FEATURE_PTHREAD
756 pthread_mutex_lock(&gethostbyaddr_mutex);
757 host = gethostbyaddr((const char *)&server.sin_addr,
758 sizeof(server.sin_addr), AF_INET);
759 pthread_mutex_unlock(&gethostbyaddr_mutex);
761 host = gethostbyaddr((const char *)&server.sin_addr,
762 sizeof(server.sin_addr), AF_INET);
766 log_error(LOG_LEVEL_ERROR, "Unable to get my own hostname: %E\n");
770 csp->my_hostname = strdup(host->h_name);
775 csp->ip_addr_str = strdup(inet_ntoa(client.sin_addr));
776 csp->ip_addr_long = ntohl(client.sin_addr.s_addr);
783 /*********************************************************************
785 * Function : resolve_hostname_to_ip
787 * Description : Resolve a hostname to an internet tcp/ip address.
788 * NULL or an empty string resolve to INADDR_ANY.
791 * 1 : host = hostname to resolve
793 * Returns : INADDR_NONE => failure, INADDR_ANY or tcp/ip address if succesful.
795 *********************************************************************/
796 unsigned long resolve_hostname_to_ip(const char *host)
798 struct sockaddr_in inaddr;
799 struct hostent *hostp;
800 unsigned int dns_retries = 0;
801 #if defined(HAVE_GETHOSTBYNAME_R_6_ARGS) || defined(HAVE_GETHOSTBYNAME_R_5_ARGS) || defined(HAVE_GETHOSTBYNAME_R_3_ARGS)
802 struct hostent result;
803 #if defined(HAVE_GETHOSTBYNAME_R_6_ARGS) || defined(HAVE_GETHOSTBYNAME_R_5_ARGS)
804 char hbuf[HOSTENT_BUFFER_SIZE];
806 #else /* defined(HAVE_GETHOSTBYNAME_R_3_ARGS) */
807 struct hostent_data hdata;
808 #endif /* def HAVE_GETHOSTBYNAME_R_(6|5)_ARGS */
809 #endif /* def HAVE_GETHOSTBYNAME_R_(6|5|3)_ARGS */
811 if ((host == NULL) || (*host == '\0'))
816 memset((char *) &inaddr, 0, sizeof inaddr);
818 if ((inaddr.sin_addr.s_addr = inet_addr(host)) == -1)
820 #if defined(HAVE_GETHOSTBYNAME_R_6_ARGS)
821 while ( gethostbyname_r(host, &result, hbuf,
822 HOSTENT_BUFFER_SIZE, &hostp, &thd_err)
823 && (thd_err == TRY_AGAIN) && (dns_retries++ < 10) )
825 log_error(LOG_LEVEL_ERROR, "Timeout #%u while trying to resolve %s. Trying again.",
828 #elif defined(HAVE_GETHOSTBYNAME_R_5_ARGS)
829 hostp = gethostbyname_r(host, &result, hbuf,
830 HOSTENT_BUFFER_SIZE, &thd_err);
831 #elif defined(HAVE_GETHOSTBYNAME_R_3_ARGS)
832 if (0 == gethostbyname_r(host, &result, &hdata))
840 #elif FEATURE_PTHREAD
841 pthread_mutex_lock(&gethostbyname_mutex);
842 while ( NULL == (hostp = gethostbyname(host))
843 && (h_errno == TRY_AGAIN) && (dns_retries++ < 10) )
845 log_error(LOG_LEVEL_ERROR, "Timeout #%u while trying to resolve %s. Trying again.",
848 pthread_mutex_unlock(&gethostbyname_mutex);
850 while ( NULL == (hostp = gethostbyname(host))
851 && (h_errno == TRY_AGAIN) && (dns_retries++ < 10) )
853 log_error(LOG_LEVEL_ERROR, "Timeout #%u while trying to resolve %s. Trying again.",
856 #endif /* def HAVE_GETHOSTBYNAME_R_(6|5|3)_ARGS */
858 * On Mac OSX, if a domain exists but doesn't have a type A
859 * record associated with it, the h_addr member of the struct
860 * hostent returned by gethostbyname is NULL, even if h_length
861 * is 4. Therefore the second test below.
863 if (hostp == NULL || hostp->h_addr == NULL)
866 log_error(LOG_LEVEL_ERROR, "could not resolve hostname %s", host);
869 if (hostp->h_addrtype != AF_INET)
872 errno = WSAEPROTOTYPE;
876 log_error(LOG_LEVEL_ERROR, "hostname %s resolves to unknown address type.", host);
880 (char *) &inaddr.sin_addr,
881 (char *) hostp->h_addr,
882 sizeof(inaddr.sin_addr)
885 return(inaddr.sin_addr.s_addr);