1 const char jbsockets_rcs[] = "$Id: jbsockets.c,v 1.39 2006/08/03 02:46:41 david__schmidt 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 1.39 2006/08/03 02:46:41 david__schmidt
39 * Incorporate Fabian Keil's patch work:
\rhttp://www.fabiankeil.de/sourcecode/privoxy/
41 * Revision 1.38 2006/07/18 14:48:46 david__schmidt
42 * Reorganizing the repository: swapping out what was HEAD (the old 3.1 branch)
43 * with what was really the latest development (the v_3_0_branch branch)
45 * Revision 1.35.2.8 2006/01/21 16:16:08 david__schmidt
46 * Thanks to Edward Carrel for his patch to modernize OSX's
\rpthreads support. See bug #1409623.
48 * Revision 1.35.2.7 2005/05/07 21:50:55 david__schmidt
49 * A few memory leaks plugged (mostly on error paths)
51 * Revision 1.35.2.6 2003/12/17 16:34:40 oes
54 * Revision 1.35.2.5 2003/04/29 11:32:54 oes
55 * Don't rely on h_addr being non-NULL after gethostbyname.
56 * Works around an oddness in Max OSX and closes bug #724796
58 * Revision 1.35.2.4 2003/04/04 12:40:20 oes
59 * Made sure the errno set by bind, not close[socket] is used in
60 * bind_port. Probably fixes bugs #713777, #705562.
62 * Revision 1.35.2.3 2003/03/07 03:41:04 david__schmidt
63 * 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.
65 * Revision 1.35.2.2 2002/11/20 14:37:24 oes
66 * Fixed Win32 error logging in bind_port.
67 * Thanks to Oliver Stoeneberg for the hint.
69 * Revision 1.35.2.1 2002/05/26 23:41:27 joergs
70 * AmigaOS: Fixed wrong type of len in write_socket()
72 * Revision 1.35 2002/04/26 15:50:04 joergs
73 * AmigaOS: No socklen_t, added AMIGA to the systems using int instead.
75 * Revision 1.34 2002/04/08 20:31:41 swa
78 * Revision 1.33 2002/04/03 16:02:18 gliptak
79 * Correcting compile warning with older gcc
81 * Revision 1.32 2002/03/31 17:18:59 jongfoster
82 * Win32 only: Enabling STRICT to fix a VC++ compile warning.
84 * Revision 1.31 2002/03/29 03:33:13 david__schmidt
85 * Fix Mac OSX compiler warnings
87 * Revision 1.30 2002/03/27 14:32:43 david__schmidt
88 * More compiler warning message maintenance
90 * Revision 1.29 2002/03/26 22:29:54 swa
91 * we have a new homepage!
93 * Revision 1.28 2002/03/24 13:25:43 swa
94 * name change related issues
96 * Revision 1.27 2002/03/13 00:27:05 jongfoster
99 * Revision 1.26 2002/03/11 22:07:02 david__schmidt
100 * OS/2 port maintenance:
101 * - Fixed EMX build - it had decayed a little
102 * - Fixed inexplicable crash during FD_ZERO - must be due to a bad macro.
103 * substituted a memset for now.
105 * Revision 1.25 2002/03/09 20:03:52 jongfoster
106 * - Making various functions return int rather than size_t.
107 * (Undoing a recent change). Since size_t is unsigned on
108 * Windows, functions like read_socket that return -1 on
109 * error cannot return a size_t.
111 * THIS WAS A MAJOR BUG - it caused frequent, unpredictable
112 * crashes, and also frequently caused JB to jump to 100%
113 * CPU and stay there. (Because it thought it had just
114 * read ((unsigned)-1) == 4Gb of data...)
116 * - The signature of write_socket has changed, it now simply
117 * returns success=0/failure=nonzero.
119 * - Trying to get rid of a few warnings --with-debug on
120 * Windows, I've introduced a new type "jb_socket". This is
121 * used for the socket file descriptors. On Windows, this
122 * is SOCKET (a typedef for unsigned). Everywhere else, it's
123 * an int. The error value can't be -1 any more, so it's
124 * now JB_INVALID_SOCKET (which is -1 on UNIX, and in
125 * Windows it maps to the #define INVALID_SOCKET.)
127 * - The signature of bind_port has changed.
129 * Revision 1.24 2002/03/07 03:51:36 oes
130 * - Improved handling of failed DNS lookups
131 * - Fixed compiler warnings etc
133 * Revision 1.23 2002/03/05 00:36:01 jongfoster
134 * Fixing bug 514988 - unable to restart Junkbuster
136 * Revision 1.22 2002/03/04 02:08:02 david__schmidt
137 * Enable web editing of actions file on OS/2 (it had been broken all this time!)
139 * Revision 1.21 2002/01/09 14:32:33 oes
140 * Added support for gethostbyname_r and gethostbyaddr_r.
142 * Revision 1.20 2001/11/16 00:48:48 jongfoster
143 * Enabling duplicate-socket detection for all platforms, not
146 * Revision 1.19 2001/10/25 03:40:47 david__schmidt
147 * Change in porting tactics: OS/2's EMX porting layer doesn't allow multiple
148 * threads to call select() simultaneously. So, it's time to do a real, live,
149 * native OS/2 port. See defines for __EMX__ (the porting layer) vs. __OS2__
150 * (native). Both versions will work, but using __OS2__ offers multi-threading.
152 * Revision 1.18 2001/09/21 23:02:02 david__schmidt
153 * Cleaning up 2 compiler warnings on OS/2.
155 * Revision 1.17 2001/09/13 20:11:46 jongfoster
156 * Fixing 2 compiler warnings under Win32
158 * Revision 1.16 2001/07/30 22:08:36 jongfoster
159 * Tidying up #defines:
160 * - All feature #defines are now of the form FEATURE_xxx
161 * - Permanently turned off WIN_GUI_EDIT
162 * - Permanently turned on WEBDAV and SPLIT_PROXY_ARGS
164 * Revision 1.15 2001/07/29 17:40:43 jongfoster
165 * Fixed compiler warning by adding a cast
167 * Revision 1.14 2001/07/18 13:47:59 oes
168 * Eliminated dirty hack for getsockbyname()
170 * Revision 1.13 2001/07/15 13:56:57 jongfoster
171 * Removing unused local variable.
173 * Revision 1.12 2001/07/01 17:04:11 oes
174 * Bugfix: accept_connection no longer uses the obsolete hstrerror() function
176 * Revision 1.11 2001/06/29 21:45:41 oes
177 * Indentation, CRLF->LF, Tab-> Space
179 * Revision 1.10 2001/06/29 13:29:15 oes
180 * - Added remote (server) host IP to csp->http->host_ip_addr_str
181 * - Added detection of local socket IP and fqdn
182 * - Removed logentry from cancelled commit
184 * Revision 1.9 2001/06/07 23:06:09 jongfoster
185 * The host parameter to connect_to() is now const.
187 * Revision 1.8 2001/06/03 19:12:07 oes
190 * Revision 1.7 2001/05/28 16:14:00 jongfoster
191 * Fixing bug in LOG_LEVEL_LOG
193 * Revision 1.6 2001/05/26 17:28:32 jongfoster
194 * Fixed LOG_LEVEL_LOG
196 * Revision 1.5 2001/05/26 15:26:15 jongfoster
197 * ACL feature now provides more security by immediately dropping
198 * connections from untrusted hosts.
200 * Revision 1.4 2001/05/26 00:37:42 jongfoster
201 * Cosmetic indentation correction.
203 * Revision 1.3 2001/05/25 21:57:54 jongfoster
204 * Now gives a warning under Windows if you try to bind
205 * it to a port that's already in use.
207 * Revision 1.2 2001/05/17 23:01:01 oes
208 * - Cleaned CRLF's from the sources and related files
210 * Revision 1.1.1.1 2001/05/15 13:58:54 oes
211 * Initial import of version 2.9.3 source tree
214 *********************************************************************/
224 #include <sys/types.h>
232 #include <sys/timeb.h>
240 #include <sys/time.h>
241 #include <netinet/in.h>
242 #include <sys/ioctl.h>
244 #include <sys/socket.h>
247 #include <netinet/tcp.h>
249 #include <arpa/inet.h>
255 #if defined(__EMX__) || defined (__OS2__)
256 #include <sys/select.h> /* OS/2/EMX needs a little help with select */
266 #if defined(OSX_DARWIN) || defined(__OpenBSD__)
268 /* jcc.h is for mutex semaphores only */
269 #endif /* defined(OSX_DARWIN) || defined(__OpenBSD__) */
271 #include "jbsockets.h"
275 const char jbsockets_h_rcs[] = JBSOCKETS_H_VERSION;
278 /*********************************************************************
280 * Function : connect_to
282 * Description : Open a socket and connect to it. Will check
283 * that this is allowed according to ACL.
286 * 1 : host = hostname to connect to
287 * 2 : portnum = port to connent on
288 * 3 : csp = Current client state (buffers, headers, etc...)
289 * Not modified, only used for source IP and ACL.
291 * Returns : JB_INVALID_SOCKET => failure, else it is the socket
294 *********************************************************************/
295 jb_socket connect_to(const char *host, int portnum, struct client_state *csp)
297 struct sockaddr_in inaddr;
301 struct timeval tv[1];
302 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA)
304 #endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) */
307 struct access_control_addr dst[1];
308 #endif /* def FEATURE_ACL */
310 memset((char *)&inaddr, 0, sizeof inaddr);
312 if ((addr = resolve_hostname_to_ip(host)) == INADDR_NONE)
314 csp->http->host_ip_addr_str = strdup("unknown");
315 return(JB_INVALID_SOCKET);
319 dst->addr = ntohl((unsigned long) addr);
322 if (block_acl(dst, csp))
329 return(JB_INVALID_SOCKET);
331 #endif /* def FEATURE_ACL */
333 inaddr.sin_addr.s_addr = addr;
334 inaddr.sin_family = AF_INET;
335 csp->http->host_ip_addr_str = strdup(inet_ntoa(inaddr.sin_addr));
338 if (sizeof(inaddr.sin_port) == sizeof(short))
339 #endif /* ndef _WIN32 */
341 inaddr.sin_port = htons((unsigned short) portnum);
346 inaddr.sin_port = htonl((unsigned long)portnum);
348 #endif /* ndef _WIN32 */
351 if ((fd = socket(inaddr.sin_family, SOCK_STREAM, 0)) == JB_INVALID_SOCKET)
353 if ((fd = socket(inaddr.sin_family, SOCK_STREAM, 0)) < 0)
356 return(JB_INVALID_SOCKET);
360 { /* turn off TCP coalescence */
362 setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, (char *) &mi, sizeof (int));
364 #endif /* def TCP_NODELAY */
366 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
367 if ((flags = fcntl(fd, F_GETFL, 0)) != -1)
370 fcntl(fd, F_SETFL, flags);
372 #endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__) */
374 while (connect(fd, (struct sockaddr *) & inaddr, sizeof inaddr) == JB_INVALID_SOCKET)
377 if (errno == WSAEINPROGRESS)
379 if (sock_errno() == EINPROGRESS)
380 #else /* ifndef _WIN32 */
381 if (errno == EINPROGRESS)
382 #endif /* ndef _WIN32 || __OS2__ */
388 if (sock_errno() != EINTR)
394 return(JB_INVALID_SOCKET);
398 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
402 fcntl(fd, F_SETFL, flags);
404 #endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__) */
406 /* wait for connection to complete */
413 /* MS Windows uses int, not SOCKET, for the 1st arg of select(). Wierd! */
414 if (select((int)fd + 1, NULL, &wfds, NULL, tv) <= 0)
417 return(JB_INVALID_SOCKET);
424 /*********************************************************************
426 * Function : write_socket
428 * Description : Write the contents of buf (for n bytes) to socket fd.
431 * 1 : fd = file descriptor (aka. handle) of socket to write to.
432 * 2 : buf = pointer to data to be written.
433 * 3 : len = length of data to be written to the socket "fd".
435 * Returns : 0 on success (entire buffer sent).
438 *********************************************************************/
440 int write_socket(jb_socket fd, const char *buf, ssize_t len)
442 int write_socket(jb_socket fd, const char *buf, size_t len)
450 if (len < 0) /* constant condition - size_t isn't ever negative */
455 log_error(LOG_LEVEL_LOG, "%N", len, buf);
458 return (send(fd, buf, (int)len, 0) != (int)len);
459 #elif defined(__BEOS__) || defined(AMIGA)
460 return (send(fd, buf, len, 0) != len);
461 #elif defined(__OS2__)
463 * Break the data up into SOCKET_SEND_MAX chunks for sending...
464 * OS/2 seemed to complain when the chunks were too large.
466 #define SOCKET_SEND_MAX 65000
468 int write_len = 0, send_len, send_rc = 0, i = 0;
469 while ((i < len) && (send_rc != -1))
471 if ((i + SOCKET_SEND_MAX) > len)
474 send_len = SOCKET_SEND_MAX;
475 send_rc = send(fd,(char*)buf + i, send_len, 0);
483 return (write(fd, buf, len) != len);
489 /*********************************************************************
491 * Function : read_socket
493 * Description : Read from a TCP/IP socket in a platform independent way.
496 * 1 : fd = file descriptor of the socket to read
497 * 2 : buf = pointer to buffer where data will be written
498 * Must be >= len bytes long.
499 * 3 : len = maximum number of bytes to read
501 * Returns : On success, the number of bytes read is returned (zero
502 * indicates end of file), and the file position is advanced
503 * by this number. It is not an error if this number is
504 * smaller than the number of bytes requested; this may hap-
505 * pen for example because fewer bytes are actually available
506 * right now (maybe because we were close to end-of-file, or
507 * because we are reading from a pipe, or from a terminal,
508 * or because read() was interrupted by a signal). On error,
509 * -1 is returned, and errno is set appropriately. In this
510 * case it is left unspecified whether the file position (if
513 *********************************************************************/
514 int read_socket(jb_socket fd, char *buf, int len)
522 return(recv(fd, buf, len, 0));
523 #elif defined(__BEOS__) || defined(AMIGA) || defined(__OS2__)
524 return(recv(fd, buf, (size_t)len, 0));
526 return(read(fd, buf, (size_t)len));
531 /*********************************************************************
533 * Function : close_socket
535 * Description : Closes a TCP/IP socket
538 * 1 : fd = file descriptor of socket to be closed
542 *********************************************************************/
543 void close_socket(jb_socket fd)
545 #if defined(_WIN32) || defined(__BEOS__)
549 #elif defined(__OS2__)
558 /*********************************************************************
560 * Function : bind_port
562 * Description : Call socket, set socket options, and listen.
563 * Called by listen_loop to "boot up" our proxy address.
566 * 1 : hostnam = TCP/IP address to bind/listen to
567 * 2 : portnum = port to listen on
568 * 3 : pfd = pointer used to return file descriptor.
570 * Returns : if success, returns 0 and sets *pfd.
571 * if failure, returns -3 if address is in use,
572 * -2 if address unresolvable,
574 *********************************************************************/
575 int bind_port(const char *hostnam, int portnum, jb_socket *pfd)
577 struct sockaddr_in inaddr;
581 #endif /* ndef _WIN32 */
583 *pfd = JB_INVALID_SOCKET;
585 memset((char *)&inaddr, '\0', sizeof inaddr);
587 inaddr.sin_family = AF_INET;
588 inaddr.sin_addr.s_addr = resolve_hostname_to_ip(hostnam);
590 if (inaddr.sin_addr.s_addr == INADDR_NONE)
596 if (sizeof(inaddr.sin_port) == sizeof(short))
597 #endif /* ndef _WIN32 */
599 inaddr.sin_port = htons((unsigned short) portnum);
604 inaddr.sin_port = htonl((unsigned long) portnum);
606 #endif /* ndef _WIN32 */
608 fd = socket(AF_INET, SOCK_STREAM, 0);
611 if (fd == JB_INVALID_SOCKET)
621 * This is not needed for Win32 - in fact, it stops
622 * duplicate instances of Privoxy from being caught.
624 * On UNIX, we assume the user is sensible enough not
625 * to start Junkbuster multiple times on the same IP.
626 * Without this, stopping and restarting Privoxy
627 * from a script fails.
628 * Note: SO_REUSEADDR is meant to only take over
629 * sockets which are *not* in listen state in Linux,
630 * e.g. sockets in TIME_WAIT. YMMV.
632 setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char *)&one, sizeof(one));
633 #endif /* ndef _WIN32 */
635 if (bind(fd, (struct sockaddr *)&inaddr, sizeof(inaddr)) < 0)
638 errno = WSAGetLastError();
639 if (errno == WSAEADDRINUSE)
641 if (errno == EADDRINUSE)
654 while (listen(fd, 5) == -1)
668 /*********************************************************************
670 * Function : accept_connection
672 * Description : Accepts a connection on a socket. Socket must have
673 * been created using bind_port().
676 * 1 : csp = Client state, cfd, ip_addr_str, and
677 * ip_addr_long will be set by this routine.
678 * 2 : fd = file descriptor returned from bind_port
680 * Returns : when a connection is accepted, it returns 1 (TRUE).
681 * On an error it returns 0 (FALSE).
683 *********************************************************************/
684 int accept_connection(struct client_state * csp, jb_socket fd)
686 struct sockaddr_in client, server;
687 struct hostent *host = NULL;
689 #if defined(_WIN32) || defined(__OS2__) || defined(__APPLE_CC__) || defined(AMIGA)
690 /* Wierdness - fix a warning. */
691 int c_length, s_length;
693 socklen_t c_length, s_length;
695 #if defined(HAVE_GETHOSTBYADDR_R_8_ARGS) || defined(HAVE_GETHOSTBYADDR_R_7_ARGS) || defined(HAVE_GETHOSTBYADDR_R_5_ARGS)
696 struct hostent result;
697 #if defined(HAVE_GETHOSTBYADDR_R_5_ARGS)
698 struct hostent_data hdata;
700 char hbuf[HOSTENT_BUFFER_SIZE];
702 #endif /* def HAVE_GETHOSTBYADDR_R_5_ARGS */
703 #endif /* def HAVE_GETHOSTBYADDR_R_(8|7|5)_ARGS */
705 c_length = s_length = sizeof(client);
708 afd = accept (fd, (struct sockaddr *) &client, &c_length);
709 if (afd == JB_INVALID_SOCKET)
716 afd = accept (fd, (struct sockaddr *) &client, &c_length);
717 } while (afd < 1 && errno == EINTR);
725 * Determine the IP-Adress that the client used to reach us
726 * and the hostname associated with that address
728 if (!getsockname(afd, (struct sockaddr *) &server, &s_length))
730 csp->my_ip_addr_str = strdup(inet_ntoa(server.sin_addr));
731 #if defined(HAVE_GETHOSTBYADDR_R_8_ARGS)
732 gethostbyaddr_r((const char *)&server.sin_addr,
733 sizeof(server.sin_addr), AF_INET,
734 &result, hbuf, HOSTENT_BUFFER_SIZE,
736 #elif defined(HAVE_GETHOSTBYADDR_R_7_ARGS)
737 host = gethostbyaddr_r((const char *)&server.sin_addr,
738 sizeof(server.sin_addr), AF_INET,
739 &result, hbuf, HOSTENT_BUFFER_SIZE, &thd_err);
740 #elif defined(HAVE_GETHOSTBYADDR_R_5_ARGS)
741 if (0 == gethostbyaddr_r((const char *)&server.sin_addr,
742 sizeof(server.sin_addr), AF_INET,
751 #elif defined(OSX_DARWIN) || defined(__OpenBSD__)
752 pthread_mutex_lock(&gethostbyaddr_mutex);
753 host = gethostbyaddr((const char *)&server.sin_addr,
754 sizeof(server.sin_addr), AF_INET);
755 pthread_mutex_unlock(&gethostbyaddr_mutex);
757 host = gethostbyaddr((const char *)&server.sin_addr,
758 sizeof(server.sin_addr), AF_INET);
762 log_error(LOG_LEVEL_ERROR, "Unable to get my own hostname: %E\n");
766 csp->my_hostname = strdup(host->h_name);
771 csp->ip_addr_str = strdup(inet_ntoa(client.sin_addr));
772 csp->ip_addr_long = ntohl(client.sin_addr.s_addr);
779 /*********************************************************************
781 * Function : resolve_hostname_to_ip
783 * Description : Resolve a hostname to an internet tcp/ip address.
784 * NULL or an empty string resolve to INADDR_ANY.
787 * 1 : host = hostname to resolve
789 * Returns : INADDR_NONE => failure, INADDR_ANY or tcp/ip address if succesful.
791 *********************************************************************/
792 unsigned long resolve_hostname_to_ip(const char *host)
794 struct sockaddr_in inaddr;
795 struct hostent *hostp;
796 unsigned int dns_retries = 0;
797 #if defined(HAVE_GETHOSTBYNAME_R_6_ARGS) || defined(HAVE_GETHOSTBYNAME_R_5_ARGS) || defined(HAVE_GETHOSTBYNAME_R_3_ARGS)
798 struct hostent result;
799 #if defined(HAVE_GETHOSTBYNAME_R_6_ARGS) || defined(HAVE_GETHOSTBYNAME_R_5_ARGS)
800 char hbuf[HOSTENT_BUFFER_SIZE];
802 #else /* defined(HAVE_GETHOSTBYNAME_R_3_ARGS) */
803 struct hostent_data hdata;
804 #endif /* def HAVE_GETHOSTBYNAME_R_(6|5)_ARGS */
805 #endif /* def HAVE_GETHOSTBYNAME_R_(6|5|3)_ARGS */
807 if ((host == NULL) || (*host == '\0'))
812 memset((char *) &inaddr, 0, sizeof inaddr);
814 if ((inaddr.sin_addr.s_addr = inet_addr(host)) == -1)
816 #if defined(HAVE_GETHOSTBYNAME_R_6_ARGS)
817 while ( gethostbyname_r(host, &result, hbuf,
818 HOSTENT_BUFFER_SIZE, &hostp, &thd_err)
819 && (thd_err == TRY_AGAIN) && (dns_retries++ < 10) )
821 log_error(LOG_LEVEL_ERROR, "Timeout #%u while trying to resolve %s. Trying again.",
824 #elif defined(HAVE_GETHOSTBYNAME_R_5_ARGS)
825 hostp = gethostbyname_r(host, &result, hbuf,
826 HOSTENT_BUFFER_SIZE, &thd_err);
827 #elif defined(HAVE_GETHOSTBYNAME_R_3_ARGS)
828 if (0 == gethostbyname_r(host, &result, &hdata))
836 #elif defined(OSX_DARWIN) || defined(__OpenBSD__)
837 pthread_mutex_lock(&gethostbyname_mutex);
838 while ( NULL == (hostp = gethostbyname(host))
839 && (h_errno == TRY_AGAIN) && (dns_retries++ < 10) )
841 log_error(LOG_LEVEL_ERROR, "Timeout #%u while trying to resolve %s. Trying again.",
844 pthread_mutex_unlock(&gethostbyname_mutex);
846 while ( NULL == (hostp = gethostbyname(host))
847 && (h_errno == TRY_AGAIN) && (dns_retries++ < 10) )
849 log_error(LOG_LEVEL_ERROR, "Timeout #%u while trying to resolve %s. Trying again.",
852 #endif /* def HAVE_GETHOSTBYNAME_R_(6|5|3)_ARGS */
854 * On Mac OSX, if a domain exists but doesn't have a type A
855 * record associated with it, the h_addr member of the struct
856 * hostent returned by gethostbyname is NULL, even if h_length
857 * is 4. Therefore the second test below.
859 if (hostp == NULL || hostp->h_addr == NULL)
862 log_error(LOG_LEVEL_ERROR, "could not resolve hostname %s", host);
865 if (hostp->h_addrtype != AF_INET)
868 errno = WSAEPROTOTYPE;
872 log_error(LOG_LEVEL_ERROR, "hostname %s resolves to unknown address type.", host);
876 (char *) &inaddr.sin_addr,
877 (char *) hostp->h_addr,
878 sizeof(inaddr.sin_addr)
881 return(inaddr.sin_addr.s_addr);