1 const char jbsockets_rcs[] = "$Id: jbsockets.c,v 1.43 2007/06/01 18:16:36 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 1.43 2007/06/01 18:16:36 fabiankeil
39 * Use the same mutex for gethostbyname() and gethostbyaddr() to prevent
40 * deadlocks and crashes on OpenBSD and possibly other OS with neither
41 * gethostbyname_r() nor gethostaddr_r(). Closes BR#1729174.
42 * Thanks to Ralf Horstmann for report and solution.
44 * Revision 1.42 2007/04/01 17:37:07 fabiankeil
45 * - Add DNS retries for Solaris and other systems
46 * whose gethostbyname_r version takes five arguments.
47 * - Move maximum number of DNS retries into a macro.
49 * Revision 1.41 2006/11/13 19:05:51 fabiankeil
50 * Make pthread mutex locking more generic. Instead of
51 * checking for OSX and OpenBSD, check for FEATURE_PTHREAD
52 * and use mutex locking unless there is an _r function
53 * available. Better safe than sorry.
55 * Fixes "./configure --disable-pthread" and should result
56 * in less threading-related problems on pthread-using platforms,
57 * but it still doesn't fix BR#1122404.
59 * Revision 1.40 2006/09/02 15:36:42 fabiankeil
60 * Follow the OpenBSD port's lead and protect the resolve
61 * functions on OpenBSD as well.
63 * Revision 1.39 2006/08/03 02:46:41 david__schmidt
64 * Incorporate Fabian Keil's patch work:
\rhttp://www.fabiankeil.de/sourcecode/privoxy/
66 * Revision 1.38 2006/07/18 14:48:46 david__schmidt
67 * Reorganizing the repository: swapping out what was HEAD (the old 3.1 branch)
68 * with what was really the latest development (the v_3_0_branch branch)
70 * Revision 1.35.2.8 2006/01/21 16:16:08 david__schmidt
71 * Thanks to Edward Carrel for his patch to modernize OSX's
\rpthreads support. See bug #1409623.
73 * Revision 1.35.2.7 2005/05/07 21:50:55 david__schmidt
74 * A few memory leaks plugged (mostly on error paths)
76 * Revision 1.35.2.6 2003/12/17 16:34:40 oes
79 * Revision 1.35.2.5 2003/04/29 11:32:54 oes
80 * Don't rely on h_addr being non-NULL after gethostbyname.
81 * Works around an oddness in Max OSX and closes bug #724796
83 * Revision 1.35.2.4 2003/04/04 12:40:20 oes
84 * Made sure the errno set by bind, not close[socket] is used in
85 * bind_port. Probably fixes bugs #713777, #705562.
87 * Revision 1.35.2.3 2003/03/07 03:41:04 david__schmidt
88 * 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.
90 * Revision 1.35.2.2 2002/11/20 14:37:24 oes
91 * Fixed Win32 error logging in bind_port.
92 * Thanks to Oliver Stoeneberg for the hint.
94 * Revision 1.35.2.1 2002/05/26 23:41:27 joergs
95 * AmigaOS: Fixed wrong type of len in write_socket()
97 * Revision 1.35 2002/04/26 15:50:04 joergs
98 * AmigaOS: No socklen_t, added AMIGA to the systems using int instead.
100 * Revision 1.34 2002/04/08 20:31:41 swa
103 * Revision 1.33 2002/04/03 16:02:18 gliptak
104 * Correcting compile warning with older gcc
106 * Revision 1.32 2002/03/31 17:18:59 jongfoster
107 * Win32 only: Enabling STRICT to fix a VC++ compile warning.
109 * Revision 1.31 2002/03/29 03:33:13 david__schmidt
110 * Fix Mac OSX compiler warnings
112 * Revision 1.30 2002/03/27 14:32:43 david__schmidt
113 * More compiler warning message maintenance
115 * Revision 1.29 2002/03/26 22:29:54 swa
116 * we have a new homepage!
118 * Revision 1.28 2002/03/24 13:25:43 swa
119 * name change related issues
121 * Revision 1.27 2002/03/13 00:27:05 jongfoster
124 * Revision 1.26 2002/03/11 22:07:02 david__schmidt
125 * OS/2 port maintenance:
126 * - Fixed EMX build - it had decayed a little
127 * - Fixed inexplicable crash during FD_ZERO - must be due to a bad macro.
128 * substituted a memset for now.
130 * Revision 1.25 2002/03/09 20:03:52 jongfoster
131 * - Making various functions return int rather than size_t.
132 * (Undoing a recent change). Since size_t is unsigned on
133 * Windows, functions like read_socket that return -1 on
134 * error cannot return a size_t.
136 * THIS WAS A MAJOR BUG - it caused frequent, unpredictable
137 * crashes, and also frequently caused JB to jump to 100%
138 * CPU and stay there. (Because it thought it had just
139 * read ((unsigned)-1) == 4Gb of data...)
141 * - The signature of write_socket has changed, it now simply
142 * returns success=0/failure=nonzero.
144 * - Trying to get rid of a few warnings --with-debug on
145 * Windows, I've introduced a new type "jb_socket". This is
146 * used for the socket file descriptors. On Windows, this
147 * is SOCKET (a typedef for unsigned). Everywhere else, it's
148 * an int. The error value can't be -1 any more, so it's
149 * now JB_INVALID_SOCKET (which is -1 on UNIX, and in
150 * Windows it maps to the #define INVALID_SOCKET.)
152 * - The signature of bind_port has changed.
154 * Revision 1.24 2002/03/07 03:51:36 oes
155 * - Improved handling of failed DNS lookups
156 * - Fixed compiler warnings etc
158 * Revision 1.23 2002/03/05 00:36:01 jongfoster
159 * Fixing bug 514988 - unable to restart Junkbuster
161 * Revision 1.22 2002/03/04 02:08:02 david__schmidt
162 * Enable web editing of actions file on OS/2 (it had been broken all this time!)
164 * Revision 1.21 2002/01/09 14:32:33 oes
165 * Added support for gethostbyname_r and gethostbyaddr_r.
167 * Revision 1.20 2001/11/16 00:48:48 jongfoster
168 * Enabling duplicate-socket detection for all platforms, not
171 * Revision 1.19 2001/10/25 03:40:47 david__schmidt
172 * Change in porting tactics: OS/2's EMX porting layer doesn't allow multiple
173 * threads to call select() simultaneously. So, it's time to do a real, live,
174 * native OS/2 port. See defines for __EMX__ (the porting layer) vs. __OS2__
175 * (native). Both versions will work, but using __OS2__ offers multi-threading.
177 * Revision 1.18 2001/09/21 23:02:02 david__schmidt
178 * Cleaning up 2 compiler warnings on OS/2.
180 * Revision 1.17 2001/09/13 20:11:46 jongfoster
181 * Fixing 2 compiler warnings under Win32
183 * Revision 1.16 2001/07/30 22:08:36 jongfoster
184 * Tidying up #defines:
185 * - All feature #defines are now of the form FEATURE_xxx
186 * - Permanently turned off WIN_GUI_EDIT
187 * - Permanently turned on WEBDAV and SPLIT_PROXY_ARGS
189 * Revision 1.15 2001/07/29 17:40:43 jongfoster
190 * Fixed compiler warning by adding a cast
192 * Revision 1.14 2001/07/18 13:47:59 oes
193 * Eliminated dirty hack for getsockbyname()
195 * Revision 1.13 2001/07/15 13:56:57 jongfoster
196 * Removing unused local variable.
198 * Revision 1.12 2001/07/01 17:04:11 oes
199 * Bugfix: accept_connection no longer uses the obsolete hstrerror() function
201 * Revision 1.11 2001/06/29 21:45:41 oes
202 * Indentation, CRLF->LF, Tab-> Space
204 * Revision 1.10 2001/06/29 13:29:15 oes
205 * - Added remote (server) host IP to csp->http->host_ip_addr_str
206 * - Added detection of local socket IP and fqdn
207 * - Removed logentry from cancelled commit
209 * Revision 1.9 2001/06/07 23:06:09 jongfoster
210 * The host parameter to connect_to() is now const.
212 * Revision 1.8 2001/06/03 19:12:07 oes
215 * Revision 1.7 2001/05/28 16:14:00 jongfoster
216 * Fixing bug in LOG_LEVEL_LOG
218 * Revision 1.6 2001/05/26 17:28:32 jongfoster
219 * Fixed LOG_LEVEL_LOG
221 * Revision 1.5 2001/05/26 15:26:15 jongfoster
222 * ACL feature now provides more security by immediately dropping
223 * connections from untrusted hosts.
225 * Revision 1.4 2001/05/26 00:37:42 jongfoster
226 * Cosmetic indentation correction.
228 * Revision 1.3 2001/05/25 21:57:54 jongfoster
229 * Now gives a warning under Windows if you try to bind
230 * it to a port that's already in use.
232 * Revision 1.2 2001/05/17 23:01:01 oes
233 * - Cleaned CRLF's from the sources and related files
235 * Revision 1.1.1.1 2001/05/15 13:58:54 oes
236 * Initial import of version 2.9.3 source tree
239 *********************************************************************/
249 #include <sys/types.h>
257 #include <sys/timeb.h>
265 #include <sys/time.h>
266 #include <netinet/in.h>
267 #include <sys/ioctl.h>
269 #include <sys/socket.h>
272 #include <netinet/tcp.h>
274 #include <arpa/inet.h>
280 #if defined(__EMX__) || defined (__OS2__)
281 #include <sys/select.h> /* OS/2/EMX needs a little help with select */
291 #ifdef FEATURE_PTHREAD
293 /* jcc.h is for mutex semaphores only */
294 #endif /* def FEATURE_PTHREAD */
296 #include "jbsockets.h"
300 const char jbsockets_h_rcs[] = JBSOCKETS_H_VERSION;
303 * Maximum number of gethostbyname(_r) retries in case of
304 * soft errors (TRY_AGAIN).
305 * XXX: Does it make sense to make this a config option?
307 #define MAX_DNS_RETRIES 10
310 /* XXX: Might not be necessary. */
311 #define SOMAXCONN 128
314 /*********************************************************************
316 * Function : connect_to
318 * Description : Open a socket and connect to it. Will check
319 * that this is allowed according to ACL.
322 * 1 : host = hostname to connect to
323 * 2 : portnum = port to connent on
324 * 3 : csp = Current client state (buffers, headers, etc...)
325 * Not modified, only used for source IP and ACL.
327 * Returns : JB_INVALID_SOCKET => failure, else it is the socket
330 *********************************************************************/
331 jb_socket connect_to(const char *host, int portnum, struct client_state *csp)
333 struct sockaddr_in inaddr;
337 struct timeval tv[1];
338 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA)
340 #endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) */
343 struct access_control_addr dst[1];
344 #endif /* def FEATURE_ACL */
346 memset((char *)&inaddr, 0, sizeof inaddr);
348 if ((addr = resolve_hostname_to_ip(host)) == INADDR_NONE)
350 csp->http->host_ip_addr_str = strdup("unknown");
351 return(JB_INVALID_SOCKET);
355 dst->addr = ntohl((unsigned long) addr);
358 if (block_acl(dst, csp))
365 return(JB_INVALID_SOCKET);
367 #endif /* def FEATURE_ACL */
369 inaddr.sin_addr.s_addr = addr;
370 inaddr.sin_family = AF_INET;
371 csp->http->host_ip_addr_str = strdup(inet_ntoa(inaddr.sin_addr));
374 if (sizeof(inaddr.sin_port) == sizeof(short))
375 #endif /* ndef _WIN32 */
377 inaddr.sin_port = htons((unsigned short) portnum);
382 inaddr.sin_port = htonl((unsigned long)portnum);
384 #endif /* ndef _WIN32 */
387 if ((fd = socket(inaddr.sin_family, SOCK_STREAM, 0)) == JB_INVALID_SOCKET)
389 if ((fd = socket(inaddr.sin_family, SOCK_STREAM, 0)) < 0)
392 return(JB_INVALID_SOCKET);
396 { /* turn off TCP coalescence */
398 setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, (char *) &mi, sizeof (int));
400 #endif /* def TCP_NODELAY */
402 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
403 if ((flags = fcntl(fd, F_GETFL, 0)) != -1)
406 fcntl(fd, F_SETFL, flags);
408 #endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__) */
410 while (connect(fd, (struct sockaddr *) & inaddr, sizeof inaddr) == JB_INVALID_SOCKET)
413 if (errno == WSAEINPROGRESS)
415 if (sock_errno() == EINPROGRESS)
416 #else /* ifndef _WIN32 */
417 if (errno == EINPROGRESS)
418 #endif /* ndef _WIN32 || __OS2__ */
424 if (sock_errno() != EINTR)
430 return(JB_INVALID_SOCKET);
434 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
438 fcntl(fd, F_SETFL, flags);
440 #endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__) */
442 /* wait for connection to complete */
449 /* MS Windows uses int, not SOCKET, for the 1st arg of select(). Wierd! */
450 if (select((int)fd + 1, NULL, &wfds, NULL, tv) <= 0)
453 return(JB_INVALID_SOCKET);
460 /*********************************************************************
462 * Function : write_socket
464 * Description : Write the contents of buf (for n bytes) to socket fd.
467 * 1 : fd = file descriptor (aka. handle) of socket to write to.
468 * 2 : buf = pointer to data to be written.
469 * 3 : len = length of data to be written to the socket "fd".
471 * Returns : 0 on success (entire buffer sent).
474 *********************************************************************/
476 int write_socket(jb_socket fd, const char *buf, ssize_t len)
478 int write_socket(jb_socket fd, const char *buf, size_t len)
486 if (len < 0) /* constant condition - size_t isn't ever negative */
491 log_error(LOG_LEVEL_LOG, "%N", len, buf);
494 return (send(fd, buf, (int)len, 0) != (int)len);
495 #elif defined(__BEOS__) || defined(AMIGA)
496 return (send(fd, buf, len, 0) != len);
497 #elif defined(__OS2__)
499 * Break the data up into SOCKET_SEND_MAX chunks for sending...
500 * OS/2 seemed to complain when the chunks were too large.
502 #define SOCKET_SEND_MAX 65000
504 int write_len = 0, send_len, send_rc = 0, i = 0;
505 while ((i < len) && (send_rc != -1))
507 if ((i + SOCKET_SEND_MAX) > len)
510 send_len = SOCKET_SEND_MAX;
511 send_rc = send(fd,(char*)buf + i, send_len, 0);
519 return (write(fd, buf, len) != len);
525 /*********************************************************************
527 * Function : read_socket
529 * Description : Read from a TCP/IP socket in a platform independent way.
532 * 1 : fd = file descriptor of the socket to read
533 * 2 : buf = pointer to buffer where data will be written
534 * Must be >= len bytes long.
535 * 3 : len = maximum number of bytes to read
537 * Returns : On success, the number of bytes read is returned (zero
538 * indicates end of file), and the file position is advanced
539 * by this number. It is not an error if this number is
540 * smaller than the number of bytes requested; this may hap-
541 * pen for example because fewer bytes are actually available
542 * right now (maybe because we were close to end-of-file, or
543 * because we are reading from a pipe, or from a terminal,
544 * or because read() was interrupted by a signal). On error,
545 * -1 is returned, and errno is set appropriately. In this
546 * case it is left unspecified whether the file position (if
549 *********************************************************************/
550 int read_socket(jb_socket fd, char *buf, int len)
558 return(recv(fd, buf, len, 0));
559 #elif defined(__BEOS__) || defined(AMIGA) || defined(__OS2__)
560 return(recv(fd, buf, (size_t)len, 0));
562 return(read(fd, buf, (size_t)len));
567 /*********************************************************************
569 * Function : close_socket
571 * Description : Closes a TCP/IP socket
574 * 1 : fd = file descriptor of socket to be closed
578 *********************************************************************/
579 void close_socket(jb_socket fd)
581 #if defined(_WIN32) || defined(__BEOS__)
585 #elif defined(__OS2__)
594 /*********************************************************************
596 * Function : bind_port
598 * Description : Call socket, set socket options, and listen.
599 * Called by listen_loop to "boot up" our proxy address.
602 * 1 : hostnam = TCP/IP address to bind/listen to
603 * 2 : portnum = port to listen on
604 * 3 : pfd = pointer used to return file descriptor.
606 * Returns : if success, returns 0 and sets *pfd.
607 * if failure, returns -3 if address is in use,
608 * -2 if address unresolvable,
610 *********************************************************************/
611 int bind_port(const char *hostnam, int portnum, jb_socket *pfd)
613 struct sockaddr_in inaddr;
617 #endif /* ndef _WIN32 */
619 *pfd = JB_INVALID_SOCKET;
621 memset((char *)&inaddr, '\0', sizeof inaddr);
623 inaddr.sin_family = AF_INET;
624 inaddr.sin_addr.s_addr = resolve_hostname_to_ip(hostnam);
626 if (inaddr.sin_addr.s_addr == INADDR_NONE)
632 if (sizeof(inaddr.sin_port) == sizeof(short))
633 #endif /* ndef _WIN32 */
635 inaddr.sin_port = htons((unsigned short) portnum);
640 inaddr.sin_port = htonl((unsigned long) portnum);
642 #endif /* ndef _WIN32 */
644 fd = socket(AF_INET, SOCK_STREAM, 0);
647 if (fd == JB_INVALID_SOCKET)
657 * This is not needed for Win32 - in fact, it stops
658 * duplicate instances of Privoxy from being caught.
660 * On UNIX, we assume the user is sensible enough not
661 * to start Privoxy multiple times on the same IP.
662 * Without this, stopping and restarting Privoxy
663 * from a script fails.
664 * Note: SO_REUSEADDR is meant to only take over
665 * sockets which are *not* in listen state in Linux,
666 * e.g. sockets in TIME_WAIT. YMMV.
668 setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char *)&one, sizeof(one));
669 #endif /* ndef _WIN32 */
671 if (bind(fd, (struct sockaddr *)&inaddr, sizeof(inaddr)) < 0)
674 errno = WSAGetLastError();
675 if (errno == WSAEADDRINUSE)
677 if (errno == EADDRINUSE)
690 while (listen(fd, SOMAXCONN) == -1)
704 /*********************************************************************
706 * Function : accept_connection
708 * Description : Accepts a connection on a socket. Socket must have
709 * been created using bind_port().
712 * 1 : csp = Client state, cfd, ip_addr_str, and
713 * ip_addr_long will be set by this routine.
714 * 2 : fd = file descriptor returned from bind_port
716 * Returns : when a connection is accepted, it returns 1 (TRUE).
717 * On an error it returns 0 (FALSE).
719 *********************************************************************/
720 int accept_connection(struct client_state * csp, jb_socket fd)
722 struct sockaddr_in client, server;
723 struct hostent *host = NULL;
725 #if defined(_WIN32) || defined(__OS2__) || defined(__APPLE_CC__) || defined(AMIGA)
726 /* Wierdness - fix a warning. */
727 int c_length, s_length;
729 socklen_t c_length, s_length;
731 #if defined(HAVE_GETHOSTBYADDR_R_8_ARGS) || defined(HAVE_GETHOSTBYADDR_R_7_ARGS) || defined(HAVE_GETHOSTBYADDR_R_5_ARGS)
732 struct hostent result;
733 #if defined(HAVE_GETHOSTBYADDR_R_5_ARGS)
734 struct hostent_data hdata;
736 char hbuf[HOSTENT_BUFFER_SIZE];
738 #endif /* def HAVE_GETHOSTBYADDR_R_5_ARGS */
739 #endif /* def HAVE_GETHOSTBYADDR_R_(8|7|5)_ARGS */
741 c_length = s_length = sizeof(client);
744 afd = accept (fd, (struct sockaddr *) &client, &c_length);
745 if (afd == JB_INVALID_SOCKET)
752 afd = accept (fd, (struct sockaddr *) &client, &c_length);
753 } while (afd < 1 && errno == EINTR);
761 * Determine the IP-Adress that the client used to reach us
762 * and the hostname associated with that address
764 if (!getsockname(afd, (struct sockaddr *) &server, &s_length))
766 csp->my_ip_addr_str = strdup(inet_ntoa(server.sin_addr));
767 #if defined(HAVE_GETHOSTBYADDR_R_8_ARGS)
768 gethostbyaddr_r((const char *)&server.sin_addr,
769 sizeof(server.sin_addr), AF_INET,
770 &result, hbuf, HOSTENT_BUFFER_SIZE,
772 #elif defined(HAVE_GETHOSTBYADDR_R_7_ARGS)
773 host = gethostbyaddr_r((const char *)&server.sin_addr,
774 sizeof(server.sin_addr), AF_INET,
775 &result, hbuf, HOSTENT_BUFFER_SIZE, &thd_err);
776 #elif defined(HAVE_GETHOSTBYADDR_R_5_ARGS)
777 if (0 == gethostbyaddr_r((const char *)&server.sin_addr,
778 sizeof(server.sin_addr), AF_INET,
787 #elif FEATURE_PTHREAD
788 pthread_mutex_lock(&resolver_mutex);
789 host = gethostbyaddr((const char *)&server.sin_addr,
790 sizeof(server.sin_addr), AF_INET);
791 pthread_mutex_unlock(&resolver_mutex);
793 host = gethostbyaddr((const char *)&server.sin_addr,
794 sizeof(server.sin_addr), AF_INET);
798 log_error(LOG_LEVEL_ERROR, "Unable to get my own hostname: %E\n");
802 csp->my_hostname = strdup(host->h_name);
807 csp->ip_addr_str = strdup(inet_ntoa(client.sin_addr));
808 csp->ip_addr_long = ntohl(client.sin_addr.s_addr);
815 /*********************************************************************
817 * Function : resolve_hostname_to_ip
819 * Description : Resolve a hostname to an internet tcp/ip address.
820 * NULL or an empty string resolve to INADDR_ANY.
823 * 1 : host = hostname to resolve
825 * Returns : INADDR_NONE => failure, INADDR_ANY or tcp/ip address if succesful.
827 *********************************************************************/
828 unsigned long resolve_hostname_to_ip(const char *host)
830 struct sockaddr_in inaddr;
831 struct hostent *hostp;
832 unsigned int dns_retries = 0;
833 #if defined(HAVE_GETHOSTBYNAME_R_6_ARGS) || defined(HAVE_GETHOSTBYNAME_R_5_ARGS) || defined(HAVE_GETHOSTBYNAME_R_3_ARGS)
834 struct hostent result;
835 #if defined(HAVE_GETHOSTBYNAME_R_6_ARGS) || defined(HAVE_GETHOSTBYNAME_R_5_ARGS)
836 char hbuf[HOSTENT_BUFFER_SIZE];
838 #else /* defined(HAVE_GETHOSTBYNAME_R_3_ARGS) */
839 struct hostent_data hdata;
840 #endif /* def HAVE_GETHOSTBYNAME_R_(6|5)_ARGS */
841 #endif /* def HAVE_GETHOSTBYNAME_R_(6|5|3)_ARGS */
843 if ((host == NULL) || (*host == '\0'))
848 memset((char *) &inaddr, 0, sizeof inaddr);
850 if ((inaddr.sin_addr.s_addr = inet_addr(host)) == -1)
852 #if defined(HAVE_GETHOSTBYNAME_R_6_ARGS)
853 while (gethostbyname_r(host, &result, hbuf,
854 HOSTENT_BUFFER_SIZE, &hostp, &thd_err)
855 && (thd_err == TRY_AGAIN) && (dns_retries++ < MAX_DNS_RETRIES))
857 log_error(LOG_LEVEL_ERROR,
858 "Timeout #%u while trying to resolve %s. Trying again.",
861 #elif defined(HAVE_GETHOSTBYNAME_R_5_ARGS)
862 while (NULL == (hostp = gethostbyname_r(host, &result,
863 hbuf, HOSTENT_BUFFER_SIZE, &thd_err))
864 && (thd_err == TRY_AGAIN) && (dns_retries++ < MAX_DNS_RETRIES))
866 log_error(LOG_LEVEL_ERROR,
867 "Timeout #%u while trying to resolve %s. Trying again.",
870 #elif defined(HAVE_GETHOSTBYNAME_R_3_ARGS)
872 * XXX: Doesn't retry in case of soft errors.
873 * Does this gethostbyname_r version set h_errno?
875 if (0 == gethostbyname_r(host, &result, &hdata))
883 #elif FEATURE_PTHREAD
884 pthread_mutex_lock(&resolver_mutex);
885 while (NULL == (hostp = gethostbyname(host))
886 && (h_errno == TRY_AGAIN) && (dns_retries++ < MAX_DNS_RETRIES))
888 log_error(LOG_LEVEL_ERROR,
889 "Timeout #%u while trying to resolve %s. Trying again.",
892 pthread_mutex_unlock(&resolver_mutex);
894 while (NULL == (hostp = gethostbyname(host))
895 && (h_errno == TRY_AGAIN) && (dns_retries++ < MAX_DNS_RETRIES))
897 log_error(LOG_LEVEL_ERROR,
898 "Timeout #%u while trying to resolve %s. Trying again.",
901 #endif /* def HAVE_GETHOSTBYNAME_R_(6|5|3)_ARGS */
903 * On Mac OSX, if a domain exists but doesn't have a type A
904 * record associated with it, the h_addr member of the struct
905 * hostent returned by gethostbyname is NULL, even if h_length
906 * is 4. Therefore the second test below.
908 if (hostp == NULL || hostp->h_addr == NULL)
911 log_error(LOG_LEVEL_ERROR, "could not resolve hostname %s", host);
914 if (hostp->h_addrtype != AF_INET)
917 errno = WSAEPROTOTYPE;
921 log_error(LOG_LEVEL_ERROR, "hostname %s resolves to unknown address type.", host);
925 (char *) &inaddr.sin_addr,
926 (char *) hostp->h_addr,
927 sizeof(inaddr.sin_addr)
930 return(inaddr.sin_addr.s_addr);