1 const char jbsockets_rcs[] = "$Id: jbsockets.c,v 1.45 2007/09/30 16:59:22 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 1.45 2007/09/30 16:59:22 fabiankeil
39 * Set the maximum listen() backlog to 128. Apparently SOMAXCONN is
40 * neither high enough, nor a hard limit on mingw32. Again for BR#1795281.
42 * Revision 1.44 2007/09/15 13:01:31 fabiankeil
43 * Increase listen() backlog to SOMAXCONN (or 128) to decrease
44 * chances of dropped connections under load. Problem reported
45 * and fix suggested by nobody in BR#1795281.
47 * Revision 1.43 2007/06/01 18:16:36 fabiankeil
48 * Use the same mutex for gethostbyname() and gethostbyaddr() to prevent
49 * deadlocks and crashes on OpenBSD and possibly other OS with neither
50 * gethostbyname_r() nor gethostaddr_r(). Closes BR#1729174.
51 * Thanks to Ralf Horstmann for report and solution.
53 * Revision 1.42 2007/04/01 17:37:07 fabiankeil
54 * - Add DNS retries for Solaris and other systems
55 * whose gethostbyname_r version takes five arguments.
56 * - Move maximum number of DNS retries into a macro.
58 * Revision 1.41 2006/11/13 19:05:51 fabiankeil
59 * Make pthread mutex locking more generic. Instead of
60 * checking for OSX and OpenBSD, check for FEATURE_PTHREAD
61 * and use mutex locking unless there is an _r function
62 * available. Better safe than sorry.
64 * Fixes "./configure --disable-pthread" and should result
65 * in less threading-related problems on pthread-using platforms,
66 * but it still doesn't fix BR#1122404.
68 * Revision 1.40 2006/09/02 15:36:42 fabiankeil
69 * Follow the OpenBSD port's lead and protect the resolve
70 * functions on OpenBSD as well.
72 * Revision 1.39 2006/08/03 02:46:41 david__schmidt
73 * Incorporate Fabian Keil's patch work:
\rhttp://www.fabiankeil.de/sourcecode/privoxy/
75 * Revision 1.38 2006/07/18 14:48:46 david__schmidt
76 * Reorganizing the repository: swapping out what was HEAD (the old 3.1 branch)
77 * with what was really the latest development (the v_3_0_branch branch)
79 * Revision 1.35.2.8 2006/01/21 16:16:08 david__schmidt
80 * Thanks to Edward Carrel for his patch to modernize OSX's
\rpthreads support. See bug #1409623.
82 * Revision 1.35.2.7 2005/05/07 21:50:55 david__schmidt
83 * A few memory leaks plugged (mostly on error paths)
85 * Revision 1.35.2.6 2003/12/17 16:34:40 oes
88 * Revision 1.35.2.5 2003/04/29 11:32:54 oes
89 * Don't rely on h_addr being non-NULL after gethostbyname.
90 * Works around an oddness in Max OSX and closes bug #724796
92 * Revision 1.35.2.4 2003/04/04 12:40:20 oes
93 * Made sure the errno set by bind, not close[socket] is used in
94 * bind_port. Probably fixes bugs #713777, #705562.
96 * Revision 1.35.2.3 2003/03/07 03:41:04 david__schmidt
97 * 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.
99 * Revision 1.35.2.2 2002/11/20 14:37:24 oes
100 * Fixed Win32 error logging in bind_port.
101 * Thanks to Oliver Stoeneberg for the hint.
103 * Revision 1.35.2.1 2002/05/26 23:41:27 joergs
104 * AmigaOS: Fixed wrong type of len in write_socket()
106 * Revision 1.35 2002/04/26 15:50:04 joergs
107 * AmigaOS: No socklen_t, added AMIGA to the systems using int instead.
109 * Revision 1.34 2002/04/08 20:31:41 swa
112 * Revision 1.33 2002/04/03 16:02:18 gliptak
113 * Correcting compile warning with older gcc
115 * Revision 1.32 2002/03/31 17:18:59 jongfoster
116 * Win32 only: Enabling STRICT to fix a VC++ compile warning.
118 * Revision 1.31 2002/03/29 03:33:13 david__schmidt
119 * Fix Mac OSX compiler warnings
121 * Revision 1.30 2002/03/27 14:32:43 david__schmidt
122 * More compiler warning message maintenance
124 * Revision 1.29 2002/03/26 22:29:54 swa
125 * we have a new homepage!
127 * Revision 1.28 2002/03/24 13:25:43 swa
128 * name change related issues
130 * Revision 1.27 2002/03/13 00:27:05 jongfoster
133 * Revision 1.26 2002/03/11 22:07:02 david__schmidt
134 * OS/2 port maintenance:
135 * - Fixed EMX build - it had decayed a little
136 * - Fixed inexplicable crash during FD_ZERO - must be due to a bad macro.
137 * substituted a memset for now.
139 * Revision 1.25 2002/03/09 20:03:52 jongfoster
140 * - Making various functions return int rather than size_t.
141 * (Undoing a recent change). Since size_t is unsigned on
142 * Windows, functions like read_socket that return -1 on
143 * error cannot return a size_t.
145 * THIS WAS A MAJOR BUG - it caused frequent, unpredictable
146 * crashes, and also frequently caused JB to jump to 100%
147 * CPU and stay there. (Because it thought it had just
148 * read ((unsigned)-1) == 4Gb of data...)
150 * - The signature of write_socket has changed, it now simply
151 * returns success=0/failure=nonzero.
153 * - Trying to get rid of a few warnings --with-debug on
154 * Windows, I've introduced a new type "jb_socket". This is
155 * used for the socket file descriptors. On Windows, this
156 * is SOCKET (a typedef for unsigned). Everywhere else, it's
157 * an int. The error value can't be -1 any more, so it's
158 * now JB_INVALID_SOCKET (which is -1 on UNIX, and in
159 * Windows it maps to the #define INVALID_SOCKET.)
161 * - The signature of bind_port has changed.
163 * Revision 1.24 2002/03/07 03:51:36 oes
164 * - Improved handling of failed DNS lookups
165 * - Fixed compiler warnings etc
167 * Revision 1.23 2002/03/05 00:36:01 jongfoster
168 * Fixing bug 514988 - unable to restart Junkbuster
170 * Revision 1.22 2002/03/04 02:08:02 david__schmidt
171 * Enable web editing of actions file on OS/2 (it had been broken all this time!)
173 * Revision 1.21 2002/01/09 14:32:33 oes
174 * Added support for gethostbyname_r and gethostbyaddr_r.
176 * Revision 1.20 2001/11/16 00:48:48 jongfoster
177 * Enabling duplicate-socket detection for all platforms, not
180 * Revision 1.19 2001/10/25 03:40:47 david__schmidt
181 * Change in porting tactics: OS/2's EMX porting layer doesn't allow multiple
182 * threads to call select() simultaneously. So, it's time to do a real, live,
183 * native OS/2 port. See defines for __EMX__ (the porting layer) vs. __OS2__
184 * (native). Both versions will work, but using __OS2__ offers multi-threading.
186 * Revision 1.18 2001/09/21 23:02:02 david__schmidt
187 * Cleaning up 2 compiler warnings on OS/2.
189 * Revision 1.17 2001/09/13 20:11:46 jongfoster
190 * Fixing 2 compiler warnings under Win32
192 * Revision 1.16 2001/07/30 22:08:36 jongfoster
193 * Tidying up #defines:
194 * - All feature #defines are now of the form FEATURE_xxx
195 * - Permanently turned off WIN_GUI_EDIT
196 * - Permanently turned on WEBDAV and SPLIT_PROXY_ARGS
198 * Revision 1.15 2001/07/29 17:40:43 jongfoster
199 * Fixed compiler warning by adding a cast
201 * Revision 1.14 2001/07/18 13:47:59 oes
202 * Eliminated dirty hack for getsockbyname()
204 * Revision 1.13 2001/07/15 13:56:57 jongfoster
205 * Removing unused local variable.
207 * Revision 1.12 2001/07/01 17:04:11 oes
208 * Bugfix: accept_connection no longer uses the obsolete hstrerror() function
210 * Revision 1.11 2001/06/29 21:45:41 oes
211 * Indentation, CRLF->LF, Tab-> Space
213 * Revision 1.10 2001/06/29 13:29:15 oes
214 * - Added remote (server) host IP to csp->http->host_ip_addr_str
215 * - Added detection of local socket IP and fqdn
216 * - Removed logentry from cancelled commit
218 * Revision 1.9 2001/06/07 23:06:09 jongfoster
219 * The host parameter to connect_to() is now const.
221 * Revision 1.8 2001/06/03 19:12:07 oes
224 * Revision 1.7 2001/05/28 16:14:00 jongfoster
225 * Fixing bug in LOG_LEVEL_LOG
227 * Revision 1.6 2001/05/26 17:28:32 jongfoster
228 * Fixed LOG_LEVEL_LOG
230 * Revision 1.5 2001/05/26 15:26:15 jongfoster
231 * ACL feature now provides more security by immediately dropping
232 * connections from untrusted hosts.
234 * Revision 1.4 2001/05/26 00:37:42 jongfoster
235 * Cosmetic indentation correction.
237 * Revision 1.3 2001/05/25 21:57:54 jongfoster
238 * Now gives a warning under Windows if you try to bind
239 * it to a port that's already in use.
241 * Revision 1.2 2001/05/17 23:01:01 oes
242 * - Cleaned CRLF's from the sources and related files
244 * Revision 1.1.1.1 2001/05/15 13:58:54 oes
245 * Initial import of version 2.9.3 source tree
248 *********************************************************************/
258 #include <sys/types.h>
266 #include <sys/timeb.h>
274 #include <sys/time.h>
275 #include <netinet/in.h>
276 #include <sys/ioctl.h>
278 #include <sys/socket.h>
281 #include <netinet/tcp.h>
283 #include <arpa/inet.h>
289 #if defined(__EMX__) || defined (__OS2__)
290 #include <sys/select.h> /* OS/2/EMX needs a little help with select */
300 #ifdef FEATURE_PTHREAD
302 /* jcc.h is for mutex semaphores only */
303 #endif /* def FEATURE_PTHREAD */
305 #include "jbsockets.h"
309 const char jbsockets_h_rcs[] = JBSOCKETS_H_VERSION;
312 * Maximum number of gethostbyname(_r) retries in case of
313 * soft errors (TRY_AGAIN).
314 * XXX: Does it make sense to make this a config option?
316 #define MAX_DNS_RETRIES 10
318 #define MAX_LISTEN_BACKLOG 128
321 /*********************************************************************
323 * Function : connect_to
325 * Description : Open a socket and connect to it. Will check
326 * that this is allowed according to ACL.
329 * 1 : host = hostname to connect to
330 * 2 : portnum = port to connent on
331 * 3 : csp = Current client state (buffers, headers, etc...)
332 * Not modified, only used for source IP and ACL.
334 * Returns : JB_INVALID_SOCKET => failure, else it is the socket
337 *********************************************************************/
338 jb_socket connect_to(const char *host, int portnum, struct client_state *csp)
340 struct sockaddr_in inaddr;
344 struct timeval tv[1];
345 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA)
347 #endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) */
350 struct access_control_addr dst[1];
351 #endif /* def FEATURE_ACL */
353 memset((char *)&inaddr, 0, sizeof inaddr);
355 if ((addr = resolve_hostname_to_ip(host)) == INADDR_NONE)
357 csp->http->host_ip_addr_str = strdup("unknown");
358 return(JB_INVALID_SOCKET);
362 dst->addr = ntohl((unsigned long) addr);
365 if (block_acl(dst, csp))
372 return(JB_INVALID_SOCKET);
374 #endif /* def FEATURE_ACL */
376 inaddr.sin_addr.s_addr = addr;
377 inaddr.sin_family = AF_INET;
378 csp->http->host_ip_addr_str = strdup(inet_ntoa(inaddr.sin_addr));
381 if (sizeof(inaddr.sin_port) == sizeof(short))
382 #endif /* ndef _WIN32 */
384 inaddr.sin_port = htons((unsigned short) portnum);
389 inaddr.sin_port = htonl((unsigned long)portnum);
391 #endif /* ndef _WIN32 */
394 if ((fd = socket(inaddr.sin_family, SOCK_STREAM, 0)) == JB_INVALID_SOCKET)
396 if ((fd = socket(inaddr.sin_family, SOCK_STREAM, 0)) < 0)
399 return(JB_INVALID_SOCKET);
403 { /* turn off TCP coalescence */
405 setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, (char *) &mi, sizeof (int));
407 #endif /* def TCP_NODELAY */
409 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
410 if ((flags = fcntl(fd, F_GETFL, 0)) != -1)
413 fcntl(fd, F_SETFL, flags);
415 #endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__) */
417 while (connect(fd, (struct sockaddr *) & inaddr, sizeof inaddr) == JB_INVALID_SOCKET)
420 if (errno == WSAEINPROGRESS)
422 if (sock_errno() == EINPROGRESS)
423 #else /* ifndef _WIN32 */
424 if (errno == EINPROGRESS)
425 #endif /* ndef _WIN32 || __OS2__ */
431 if (sock_errno() != EINTR)
437 return(JB_INVALID_SOCKET);
441 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
445 fcntl(fd, F_SETFL, flags);
447 #endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__) */
449 /* wait for connection to complete */
456 /* MS Windows uses int, not SOCKET, for the 1st arg of select(). Wierd! */
457 if (select((int)fd + 1, NULL, &wfds, NULL, tv) <= 0)
460 return(JB_INVALID_SOCKET);
467 /*********************************************************************
469 * Function : write_socket
471 * Description : Write the contents of buf (for n bytes) to socket fd.
474 * 1 : fd = file descriptor (aka. handle) of socket to write to.
475 * 2 : buf = pointer to data to be written.
476 * 3 : len = length of data to be written to the socket "fd".
478 * Returns : 0 on success (entire buffer sent).
481 *********************************************************************/
483 int write_socket(jb_socket fd, const char *buf, ssize_t len)
485 int write_socket(jb_socket fd, const char *buf, size_t len)
493 if (len < 0) /* constant condition - size_t isn't ever negative */
498 log_error(LOG_LEVEL_LOG, "%N", len, buf);
501 return (send(fd, buf, (int)len, 0) != (int)len);
502 #elif defined(__BEOS__) || defined(AMIGA)
503 return (send(fd, buf, len, 0) != len);
504 #elif defined(__OS2__)
506 * Break the data up into SOCKET_SEND_MAX chunks for sending...
507 * OS/2 seemed to complain when the chunks were too large.
509 #define SOCKET_SEND_MAX 65000
511 int write_len = 0, send_len, send_rc = 0, i = 0;
512 while ((i < len) && (send_rc != -1))
514 if ((i + SOCKET_SEND_MAX) > len)
517 send_len = SOCKET_SEND_MAX;
518 send_rc = send(fd,(char*)buf + i, send_len, 0);
526 return (write(fd, buf, len) != len);
532 /*********************************************************************
534 * Function : read_socket
536 * Description : Read from a TCP/IP socket in a platform independent way.
539 * 1 : fd = file descriptor of the socket to read
540 * 2 : buf = pointer to buffer where data will be written
541 * Must be >= len bytes long.
542 * 3 : len = maximum number of bytes to read
544 * Returns : On success, the number of bytes read is returned (zero
545 * indicates end of file), and the file position is advanced
546 * by this number. It is not an error if this number is
547 * smaller than the number of bytes requested; this may hap-
548 * pen for example because fewer bytes are actually available
549 * right now (maybe because we were close to end-of-file, or
550 * because we are reading from a pipe, or from a terminal,
551 * or because read() was interrupted by a signal). On error,
552 * -1 is returned, and errno is set appropriately. In this
553 * case it is left unspecified whether the file position (if
556 *********************************************************************/
557 int read_socket(jb_socket fd, char *buf, int len)
565 return(recv(fd, buf, len, 0));
566 #elif defined(__BEOS__) || defined(AMIGA) || defined(__OS2__)
567 return(recv(fd, buf, (size_t)len, 0));
569 return(read(fd, buf, (size_t)len));
574 /*********************************************************************
576 * Function : close_socket
578 * Description : Closes a TCP/IP socket
581 * 1 : fd = file descriptor of socket to be closed
585 *********************************************************************/
586 void close_socket(jb_socket fd)
588 #if defined(_WIN32) || defined(__BEOS__)
592 #elif defined(__OS2__)
601 /*********************************************************************
603 * Function : bind_port
605 * Description : Call socket, set socket options, and listen.
606 * Called by listen_loop to "boot up" our proxy address.
609 * 1 : hostnam = TCP/IP address to bind/listen to
610 * 2 : portnum = port to listen on
611 * 3 : pfd = pointer used to return file descriptor.
613 * Returns : if success, returns 0 and sets *pfd.
614 * if failure, returns -3 if address is in use,
615 * -2 if address unresolvable,
617 *********************************************************************/
618 int bind_port(const char *hostnam, int portnum, jb_socket *pfd)
620 struct sockaddr_in inaddr;
624 #endif /* ndef _WIN32 */
626 *pfd = JB_INVALID_SOCKET;
628 memset((char *)&inaddr, '\0', sizeof inaddr);
630 inaddr.sin_family = AF_INET;
631 inaddr.sin_addr.s_addr = resolve_hostname_to_ip(hostnam);
633 if (inaddr.sin_addr.s_addr == INADDR_NONE)
639 if (sizeof(inaddr.sin_port) == sizeof(short))
640 #endif /* ndef _WIN32 */
642 inaddr.sin_port = htons((unsigned short) portnum);
647 inaddr.sin_port = htonl((unsigned long) portnum);
649 #endif /* ndef _WIN32 */
651 fd = socket(AF_INET, SOCK_STREAM, 0);
654 if (fd == JB_INVALID_SOCKET)
664 * This is not needed for Win32 - in fact, it stops
665 * duplicate instances of Privoxy from being caught.
667 * On UNIX, we assume the user is sensible enough not
668 * to start Privoxy multiple times on the same IP.
669 * Without this, stopping and restarting Privoxy
670 * from a script fails.
671 * Note: SO_REUSEADDR is meant to only take over
672 * sockets which are *not* in listen state in Linux,
673 * e.g. sockets in TIME_WAIT. YMMV.
675 setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char *)&one, sizeof(one));
676 #endif /* ndef _WIN32 */
678 if (bind(fd, (struct sockaddr *)&inaddr, sizeof(inaddr)) < 0)
681 errno = WSAGetLastError();
682 if (errno == WSAEADDRINUSE)
684 if (errno == EADDRINUSE)
697 while (listen(fd, MAX_LISTEN_BACKLOG) == -1)
711 /*********************************************************************
713 * Function : get_host_information
715 * Description : Determines the IP address the client used to
716 * reach us and the hostname associated with it.
718 * XXX: Most of the code has been copy and pasted
719 * from accept_connection() and not all of the
720 * ifdefs paths have been tested afterwards.
723 * 1 : afd = File descriptor returned from accept().
724 * 2 : ip_address = Pointer to return the pointer to
725 * the ip address string.
726 * 3 : hostname = Pointer to return the pointer to
731 *********************************************************************/
732 void get_host_information(jb_socket afd, char **ip_address, char **hostname)
734 struct sockaddr_in server;
735 struct hostent *host = NULL;
736 #if defined(_WIN32) || defined(__OS2__) || defined(__APPLE_CC__) || defined(AMIGA)
737 /* according to accept_connection() this fixes a warning. */
742 #if defined(HAVE_GETHOSTBYADDR_R_8_ARGS) || defined(HAVE_GETHOSTBYADDR_R_7_ARGS) || defined(HAVE_GETHOSTBYADDR_R_5_ARGS)
743 struct hostent result;
744 #if defined(HAVE_GETHOSTBYADDR_R_5_ARGS)
745 struct hostent_data hdata;
747 char hbuf[HOSTENT_BUFFER_SIZE];
749 #endif /* def HAVE_GETHOSTBYADDR_R_5_ARGS */
750 #endif /* def HAVE_GETHOSTBYADDR_R_(8|7|5)_ARGS */
751 s_length = sizeof(server);
756 if (!getsockname(afd, (struct sockaddr *) &server, &s_length))
758 *ip_address = strdup(inet_ntoa(server.sin_addr));
759 #if defined(HAVE_GETHOSTBYADDR_R_8_ARGS)
760 gethostbyaddr_r((const char *)&server.sin_addr,
761 sizeof(server.sin_addr), AF_INET,
762 &result, hbuf, HOSTENT_BUFFER_SIZE,
764 #elif defined(HAVE_GETHOSTBYADDR_R_7_ARGS)
765 host = gethostbyaddr_r((const char *)&server.sin_addr,
766 sizeof(server.sin_addr), AF_INET,
767 &result, hbuf, HOSTENT_BUFFER_SIZE, &thd_err);
768 #elif defined(HAVE_GETHOSTBYADDR_R_5_ARGS)
769 if (0 == gethostbyaddr_r((const char *)&server.sin_addr,
770 sizeof(server.sin_addr), AF_INET,
779 #elif FEATURE_PTHREAD
780 pthread_mutex_lock(&resolver_mutex);
781 host = gethostbyaddr((const char *)&server.sin_addr,
782 sizeof(server.sin_addr), AF_INET);
783 pthread_mutex_unlock(&resolver_mutex);
785 host = gethostbyaddr((const char *)&server.sin_addr,
786 sizeof(server.sin_addr), AF_INET);
790 log_error(LOG_LEVEL_ERROR, "Unable to get my own hostname: %E\n");
794 *hostname = strdup(host->h_name);
802 /*********************************************************************
804 * Function : accept_connection
806 * Description : Accepts a connection on a socket. Socket must have
807 * been created using bind_port().
810 * 1 : csp = Client state, cfd, ip_addr_str, and
811 * ip_addr_long will be set by this routine.
812 * 2 : fd = file descriptor returned from bind_port
814 * Returns : when a connection is accepted, it returns 1 (TRUE).
815 * On an error it returns 0 (FALSE).
817 *********************************************************************/
818 int accept_connection(struct client_state * csp, jb_socket fd)
820 struct sockaddr_in client;
822 #if defined(_WIN32) || defined(__OS2__) || defined(__APPLE_CC__) || defined(AMIGA)
823 /* Wierdness - fix a warning. */
829 c_length = sizeof(client);
832 afd = accept (fd, (struct sockaddr *) &client, &c_length);
833 if (afd == JB_INVALID_SOCKET)
840 afd = accept (fd, (struct sockaddr *) &client, &c_length);
841 } while (afd < 1 && errno == EINTR);
849 csp->ip_addr_str = strdup(inet_ntoa(client.sin_addr));
850 csp->ip_addr_long = ntohl(client.sin_addr.s_addr);
857 /*********************************************************************
859 * Function : resolve_hostname_to_ip
861 * Description : Resolve a hostname to an internet tcp/ip address.
862 * NULL or an empty string resolve to INADDR_ANY.
865 * 1 : host = hostname to resolve
867 * Returns : INADDR_NONE => failure, INADDR_ANY or tcp/ip address if succesful.
869 *********************************************************************/
870 unsigned long resolve_hostname_to_ip(const char *host)
872 struct sockaddr_in inaddr;
873 struct hostent *hostp;
874 unsigned int dns_retries = 0;
875 #if defined(HAVE_GETHOSTBYNAME_R_6_ARGS) || defined(HAVE_GETHOSTBYNAME_R_5_ARGS) || defined(HAVE_GETHOSTBYNAME_R_3_ARGS)
876 struct hostent result;
877 #if defined(HAVE_GETHOSTBYNAME_R_6_ARGS) || defined(HAVE_GETHOSTBYNAME_R_5_ARGS)
878 char hbuf[HOSTENT_BUFFER_SIZE];
880 #else /* defined(HAVE_GETHOSTBYNAME_R_3_ARGS) */
881 struct hostent_data hdata;
882 #endif /* def HAVE_GETHOSTBYNAME_R_(6|5)_ARGS */
883 #endif /* def HAVE_GETHOSTBYNAME_R_(6|5|3)_ARGS */
885 if ((host == NULL) || (*host == '\0'))
890 memset((char *) &inaddr, 0, sizeof inaddr);
892 if ((inaddr.sin_addr.s_addr = inet_addr(host)) == -1)
894 #if defined(HAVE_GETHOSTBYNAME_R_6_ARGS)
895 while (gethostbyname_r(host, &result, hbuf,
896 HOSTENT_BUFFER_SIZE, &hostp, &thd_err)
897 && (thd_err == TRY_AGAIN) && (dns_retries++ < MAX_DNS_RETRIES))
899 log_error(LOG_LEVEL_ERROR,
900 "Timeout #%u while trying to resolve %s. Trying again.",
903 #elif defined(HAVE_GETHOSTBYNAME_R_5_ARGS)
904 while (NULL == (hostp = gethostbyname_r(host, &result,
905 hbuf, HOSTENT_BUFFER_SIZE, &thd_err))
906 && (thd_err == TRY_AGAIN) && (dns_retries++ < MAX_DNS_RETRIES))
908 log_error(LOG_LEVEL_ERROR,
909 "Timeout #%u while trying to resolve %s. Trying again.",
912 #elif defined(HAVE_GETHOSTBYNAME_R_3_ARGS)
914 * XXX: Doesn't retry in case of soft errors.
915 * Does this gethostbyname_r version set h_errno?
917 if (0 == gethostbyname_r(host, &result, &hdata))
925 #elif FEATURE_PTHREAD
926 pthread_mutex_lock(&resolver_mutex);
927 while (NULL == (hostp = gethostbyname(host))
928 && (h_errno == TRY_AGAIN) && (dns_retries++ < MAX_DNS_RETRIES))
930 log_error(LOG_LEVEL_ERROR,
931 "Timeout #%u while trying to resolve %s. Trying again.",
934 pthread_mutex_unlock(&resolver_mutex);
936 while (NULL == (hostp = gethostbyname(host))
937 && (h_errno == TRY_AGAIN) && (dns_retries++ < MAX_DNS_RETRIES))
939 log_error(LOG_LEVEL_ERROR,
940 "Timeout #%u while trying to resolve %s. Trying again.",
943 #endif /* def HAVE_GETHOSTBYNAME_R_(6|5|3)_ARGS */
945 * On Mac OSX, if a domain exists but doesn't have a type A
946 * record associated with it, the h_addr member of the struct
947 * hostent returned by gethostbyname is NULL, even if h_length
948 * is 4. Therefore the second test below.
950 if (hostp == NULL || hostp->h_addr == NULL)
953 log_error(LOG_LEVEL_ERROR, "could not resolve hostname %s", host);
956 if (hostp->h_addrtype != AF_INET)
959 errno = WSAEPROTOTYPE;
963 log_error(LOG_LEVEL_ERROR, "hostname %s resolves to unknown address type.", host);
967 (char *) &inaddr.sin_addr,
968 (char *) hostp->h_addr,
969 sizeof(inaddr.sin_addr)
972 return(inaddr.sin_addr.s_addr);