1 const char jbsockets_rcs[] = "$Id: jbsockets.c,v 1.82 2011/03/27 13:53:04 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) 2001-2010 the
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.
36 *********************************************************************/
46 #include <sys/types.h>
54 #include <sys/timeb.h>
63 #include <netinet/in.h>
64 #include <sys/ioctl.h>
66 #include <sys/socket.h>
69 #include <netinet/tcp.h>
71 #include <arpa/inet.h>
77 #if defined(__EMX__) || defined (__OS2__)
78 #include <sys/select.h> /* OS/2/EMX needs a little help with select */
86 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
92 #endif /* def __GLIBC__ */
93 #endif /* HAVE_POLL */
94 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
98 /* For mutex semaphores only */
101 #include "jbsockets.h"
105 /* Mac OSX doesn't define AI_NUMERICSESRV */
106 #ifndef AI_NUMERICSERV
107 #define AI_NUMERICSERV 0
110 const char jbsockets_h_rcs[] = JBSOCKETS_H_VERSION;
113 * Maximum number of gethostbyname(_r) retries in case of
114 * soft errors (TRY_AGAIN).
115 * XXX: Does it make sense to make this a config option?
117 #define MAX_DNS_RETRIES 10
119 #define MAX_LISTEN_BACKLOG 128
122 static jb_socket rfc2553_connect_to(const char *host, int portnum, struct client_state *csp);
124 static jb_socket no_rfc2553_connect_to(const char *host, int portnum, struct client_state *csp);
127 /*********************************************************************
129 * Function : connect_to
131 * Description : Open a socket and connect to it. Will check
132 * that this is allowed according to ACL.
135 * 1 : host = hostname to connect to
136 * 2 : portnum = port to connent on (XXX: should be unsigned)
137 * 3 : csp = Current client state (buffers, headers, etc...)
139 * Returns : JB_INVALID_SOCKET => failure, else it is the socket
142 *********************************************************************/
143 jb_socket connect_to(const char *host, int portnum, struct client_state *csp)
146 int forwarded_connect_retries = 0;
151 fd = rfc2553_connect_to(host, portnum, csp);
153 fd = no_rfc2553_connect_to(host, portnum, csp);
155 if ((fd != JB_INVALID_SOCKET) || (errno != EINVAL))
159 forwarded_connect_retries++;
160 log_error(LOG_LEVEL_ERROR,
161 "Attempt %d of %d to connect to %s failed. Trying again.",
162 forwarded_connect_retries, csp->config->forwarded_connect_retries, host);
164 } while (forwarded_connect_retries < csp->config->forwarded_connect_retries);
170 /* Getaddrinfo implementation */
171 static jb_socket rfc2553_connect_to(const char *host, int portnum, struct client_state *csp)
173 struct addrinfo hints, *result, *rp;
178 struct timeval tv[1];
179 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
185 struct access_control_addr dst[1];
186 #endif /* def FEATURE_ACL */
188 retval = snprintf(service, sizeof(service), "%d", portnum);
189 if ((-1 == retval) || (sizeof(service) <= retval))
191 log_error(LOG_LEVEL_ERROR,
192 "Port number (%d) ASCII decimal representation doesn't fit into 6 bytes",
194 csp->http->host_ip_addr_str = strdup("unknown");
195 return(JB_INVALID_SOCKET);
198 memset((char *)&hints, 0, sizeof(hints));
199 hints.ai_family = AF_UNSPEC;
200 hints.ai_socktype = SOCK_STREAM;
201 hints.ai_flags = AI_NUMERICSERV; /* avoid service look-up */
203 hints.ai_flags |= AI_ADDRCONFIG;
205 if ((retval = getaddrinfo(host, service, &hints, &result)))
207 log_error(LOG_LEVEL_INFO,
208 "Can not resolve %s: %s", host, gai_strerror(retval));
209 /* XXX: Should find a better way to propagate this error. */
211 csp->http->host_ip_addr_str = strdup("unknown");
212 return(JB_INVALID_SOCKET);
215 for (rp = result; rp != NULL; rp = rp->ai_next)
219 memcpy(&dst->addr, rp->ai_addr, rp->ai_addrlen);
221 if (block_acl(dst, csp))
230 #endif /* def FEATURE_ACL */
232 csp->http->host_ip_addr_str = malloc(NI_MAXHOST);
233 if (NULL == csp->http->host_ip_addr_str)
235 log_error(LOG_LEVEL_ERROR,
236 "Out of memory while getting the server IP address.");
237 return JB_INVALID_SOCKET;
239 retval = getnameinfo(rp->ai_addr, rp->ai_addrlen,
240 csp->http->host_ip_addr_str, NI_MAXHOST, NULL, 0, NI_NUMERICHOST);
241 if (!csp->http->host_ip_addr_str || retval)
243 log_error(LOG_LEVEL_ERROR,
244 "Can not save csp->http->host_ip_addr_str: %s",
245 (csp->http->host_ip_addr_str) ?
246 gai_strerror(retval) : "Insufficient memory");
247 freez(csp->http->host_ip_addr_str);
252 if ((fd = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol)) ==
255 if ((fd = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol)) < 0)
262 { /* turn off TCP coalescence */
264 setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, (char *) &mi, sizeof (int));
266 #endif /* def TCP_NODELAY */
268 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
269 if ((flags = fcntl(fd, F_GETFL, 0)) != -1)
272 fcntl(fd, F_SETFL, flags);
274 #endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__) */
277 while (connect(fd, rp->ai_addr, rp->ai_addrlen) == JB_INVALID_SOCKET)
280 if (errno == WSAEINPROGRESS)
282 if (sock_errno() == EINPROGRESS)
283 #else /* ifndef _WIN32 */
284 if (errno == EINPROGRESS)
285 #endif /* ndef _WIN32 || __OS2__ */
291 if (sock_errno() != EINTR)
306 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
310 fcntl(fd, F_SETFL, flags);
312 #endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__) */
314 /* wait for connection to complete */
321 /* MS Windows uses int, not SOCKET, for the 1st arg of select(). Wierd! */
322 if ((select((int)fd + 1, NULL, &wfds, NULL, tv) > 0)
323 && FD_ISSET(fd, &wfds))
326 socklen_t optlen = sizeof(socket_in_error);
327 if (!getsockopt(fd, SOL_SOCKET, SO_ERROR, &socket_in_error, &optlen))
329 if (!socket_in_error)
331 /* Connection established, no need to try other addresses. */
334 log_error(LOG_LEVEL_CONNECT, "Could not connect to [%s]:%s: %s.",
335 csp->http->host_ip_addr_str, service, strerror(socket_in_error));
339 log_error(LOG_LEVEL_ERROR, "Could not get the state of "
340 "the connection to [%s]:%s: %s; dropping connection.",
341 csp->http->host_ip_addr_str, service, strerror(errno));
345 /* Connection failed, try next address */
349 freeaddrinfo(result);
352 log_error(LOG_LEVEL_CONNECT, "Could not connect to [%s]:%s.",
354 return(JB_INVALID_SOCKET);
356 log_error(LOG_LEVEL_CONNECT, "Connected to %s[%s]:%s.",
357 host, csp->http->host_ip_addr_str, service);
363 #else /* ndef HAVE_RFC2553 */
364 /* Pre-getaddrinfo implementation */
366 static jb_socket no_rfc2553_connect_to(const char *host, int portnum, struct client_state *csp)
368 struct sockaddr_in inaddr;
372 struct timeval tv[1];
373 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
378 struct access_control_addr dst[1];
379 #endif /* def FEATURE_ACL */
381 memset((char *)&inaddr, 0, sizeof inaddr);
383 if ((addr = resolve_hostname_to_ip(host)) == INADDR_NONE)
385 csp->http->host_ip_addr_str = strdup("unknown");
386 return(JB_INVALID_SOCKET);
390 dst->addr = ntohl(addr);
393 if (block_acl(dst, csp))
400 return(JB_INVALID_SOCKET);
402 #endif /* def FEATURE_ACL */
404 inaddr.sin_addr.s_addr = addr;
405 inaddr.sin_family = AF_INET;
406 csp->http->host_ip_addr_str = strdup(inet_ntoa(inaddr.sin_addr));
409 if (sizeof(inaddr.sin_port) == sizeof(short))
410 #endif /* ndef _WIN32 */
412 inaddr.sin_port = htons((unsigned short) portnum);
417 inaddr.sin_port = htonl((unsigned long)portnum);
419 #endif /* ndef _WIN32 */
422 if ((fd = socket(inaddr.sin_family, SOCK_STREAM, 0)) == JB_INVALID_SOCKET)
424 if ((fd = socket(inaddr.sin_family, SOCK_STREAM, 0)) < 0)
427 return(JB_INVALID_SOCKET);
431 { /* turn off TCP coalescence */
433 setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, (char *) &mi, sizeof (int));
435 #endif /* def TCP_NODELAY */
437 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
438 if ((flags = fcntl(fd, F_GETFL, 0)) != -1)
441 fcntl(fd, F_SETFL, flags);
443 #endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__) */
445 while (connect(fd, (struct sockaddr *) & inaddr, sizeof inaddr) == JB_INVALID_SOCKET)
448 if (errno == WSAEINPROGRESS)
450 if (sock_errno() == EINPROGRESS)
451 #else /* ifndef _WIN32 */
452 if (errno == EINPROGRESS)
453 #endif /* ndef _WIN32 || __OS2__ */
459 if (sock_errno() != EINTR)
465 return(JB_INVALID_SOCKET);
469 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
473 fcntl(fd, F_SETFL, flags);
475 #endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__) */
477 /* wait for connection to complete */
484 /* MS Windows uses int, not SOCKET, for the 1st arg of select(). Wierd! */
485 if (select((int)fd + 1, NULL, &wfds, NULL, tv) <= 0)
488 return(JB_INVALID_SOCKET);
493 #endif /* ndef HAVE_RFC2553 */
496 /*********************************************************************
498 * Function : write_socket
500 * Description : Write the contents of buf (for n bytes) to socket fd.
503 * 1 : fd = file descriptor (aka. handle) of socket to write to.
504 * 2 : buf = pointer to data to be written.
505 * 3 : len = length of data to be written to the socket "fd".
507 * Returns : 0 on success (entire buffer sent).
510 *********************************************************************/
512 int write_socket(jb_socket fd, const char *buf, ssize_t len)
514 int write_socket(jb_socket fd, const char *buf, size_t len)
522 if (len < 0) /* constant condition - size_t isn't ever negative */
527 log_error(LOG_LEVEL_WRITING, "to socket %d: %N", fd, len, buf);
530 return (send(fd, buf, (int)len, 0) != (int)len);
531 #elif defined(__BEOS__) || defined(AMIGA)
532 return (send(fd, buf, len, 0) != len);
533 #elif defined(__OS2__)
535 * Break the data up into SOCKET_SEND_MAX chunks for sending...
536 * OS/2 seemed to complain when the chunks were too large.
538 #define SOCKET_SEND_MAX 65000
540 int send_len, send_rc = 0, i = 0;
541 while ((i < len) && (send_rc != -1))
543 if ((i + SOCKET_SEND_MAX) > len)
546 send_len = SOCKET_SEND_MAX;
547 send_rc = send(fd,(char*)buf + i, send_len, 0);
555 return (write(fd, buf, len) != len);
561 /*********************************************************************
563 * Function : read_socket
565 * Description : Read from a TCP/IP socket in a platform independent way.
568 * 1 : fd = file descriptor of the socket to read
569 * 2 : buf = pointer to buffer where data will be written
570 * Must be >= len bytes long.
571 * 3 : len = maximum number of bytes to read
573 * Returns : On success, the number of bytes read is returned (zero
574 * indicates end of file), and the file position is advanced
575 * by this number. It is not an error if this number is
576 * smaller than the number of bytes requested; this may hap-
577 * pen for example because fewer bytes are actually available
578 * right now (maybe because we were close to end-of-file, or
579 * because we are reading from a pipe, or from a terminal,
580 * or because read() was interrupted by a signal). On error,
581 * -1 is returned, and errno is set appropriately. In this
582 * case it is left unspecified whether the file position (if
585 *********************************************************************/
586 int read_socket(jb_socket fd, char *buf, int len)
596 ret = recv(fd, buf, len, 0);
597 #elif defined(__BEOS__) || defined(AMIGA) || defined(__OS2__)
598 ret = recv(fd, buf, (size_t)len, 0);
600 ret = (int)read(fd, buf, (size_t)len);
605 log_error(LOG_LEVEL_RECEIVED, "from socket %d: %N", fd, ret, buf);
612 /*********************************************************************
614 * Function : data_is_available
616 * Description : Waits for data to arrive on a socket.
619 * 1 : fd = file descriptor of the socket to read
620 * 2 : seconds_to_wait = number of seconds after which we give up.
622 * Returns : TRUE if data arrived in time,
625 *********************************************************************/
626 int data_is_available(jb_socket fd, int seconds_to_wait)
630 struct timeval timeout;
633 memset(&timeout, 0, sizeof(timeout));
634 timeout.tv_sec = seconds_to_wait;
637 /* Copy and pasted from jcc.c ... */
638 memset(&rfds, 0, sizeof(fd_set));
644 n = select(fd+1, &rfds, NULL, NULL, &timeout);
647 * XXX: Do we care about the different error conditions?
649 return ((n == 1) && (1 == recv(fd, buf, 1, MSG_PEEK)));
653 /*********************************************************************
655 * Function : close_socket
657 * Description : Closes a TCP/IP socket
660 * 1 : fd = file descriptor of socket to be closed
664 *********************************************************************/
665 void close_socket(jb_socket fd)
667 #if defined(_WIN32) || defined(__BEOS__)
671 #elif defined(__OS2__)
680 /*********************************************************************
682 * Function : bind_port
684 * Description : Call socket, set socket options, and listen.
685 * Called by listen_loop to "boot up" our proxy address.
688 * 1 : hostnam = TCP/IP address to bind/listen to
689 * 2 : portnum = port to listen on
690 * 3 : pfd = pointer used to return file descriptor.
692 * Returns : if success, returns 0 and sets *pfd.
693 * if failure, returns -3 if address is in use,
694 * -2 if address unresolvable,
696 *********************************************************************/
697 int bind_port(const char *hostnam, int portnum, jb_socket *pfd)
700 struct addrinfo hints;
701 struct addrinfo *result, *rp;
703 * XXX: portnum should be a string to allow symbolic service
704 * names in the configuration file and to avoid the following
710 struct sockaddr_in inaddr;
711 #endif /* def HAVE_RFC2553 */
715 #endif /* ndef _WIN32 */
717 *pfd = JB_INVALID_SOCKET;
720 retval = snprintf(servnam, sizeof(servnam), "%d", portnum);
721 if ((-1 == retval) || (sizeof(servnam) <= retval))
723 log_error(LOG_LEVEL_ERROR,
724 "Port number (%d) ASCII decimal representation doesn't fit into 6 bytes",
729 memset(&hints, 0, sizeof(struct addrinfo));
733 * XXX: This is a hack. The right thing to do
734 * would be to bind to both AF_INET and AF_INET6.
735 * This will also fail if there is no AF_INET
738 hints.ai_family = AF_INET;
742 hints.ai_family = AF_UNSPEC;
744 hints.ai_socktype = SOCK_STREAM;
745 hints.ai_flags = AI_PASSIVE;
747 hints.ai_flags |= AI_ADDRCONFIG;
749 hints.ai_protocol = 0; /* Realy any stream protocol or TCP only */
750 hints.ai_canonname = NULL;
751 hints.ai_addr = NULL;
752 hints.ai_next = NULL;
754 if ((retval = getaddrinfo(hostnam, servnam, &hints, &result)))
756 log_error(LOG_LEVEL_ERROR,
757 "Can not resolve %s: %s", hostnam, gai_strerror(retval));
761 memset((char *)&inaddr, '\0', sizeof inaddr);
763 inaddr.sin_family = AF_INET;
764 inaddr.sin_addr.s_addr = resolve_hostname_to_ip(hostnam);
766 if (inaddr.sin_addr.s_addr == INADDR_NONE)
772 if (sizeof(inaddr.sin_port) == sizeof(short))
773 #endif /* ndef _WIN32 */
775 inaddr.sin_port = htons((unsigned short) portnum);
780 inaddr.sin_port = htonl((unsigned long) portnum);
782 #endif /* ndef _WIN32 */
783 #endif /* def HAVE_RFC2553 */
786 for (rp = result; rp != NULL; rp = rp->ai_next)
788 fd = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol);
790 fd = socket(AF_INET, SOCK_STREAM, 0);
791 #endif /* def HAVE_RFC2553 */
794 if (fd == JB_INVALID_SOCKET)
808 * This is not needed for Win32 - in fact, it stops
809 * duplicate instances of Privoxy from being caught.
811 * On UNIX, we assume the user is sensible enough not
812 * to start Privoxy multiple times on the same IP.
813 * Without this, stopping and restarting Privoxy
814 * from a script fails.
815 * Note: SO_REUSEADDR is meant to only take over
816 * sockets which are *not* in listen state in Linux,
817 * e.g. sockets in TIME_WAIT. YMMV.
819 setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char *)&one, sizeof(one));
820 #endif /* ndef _WIN32 */
823 if (bind(fd, rp->ai_addr, rp->ai_addrlen) < 0)
825 if (bind(fd, (struct sockaddr *)&inaddr, sizeof(inaddr)) < 0)
829 errno = WSAGetLastError();
830 if (errno == WSAEADDRINUSE)
832 if (errno == EADDRINUSE)
836 freeaddrinfo(result);
853 /* bind() succeeded, escape from for-loop */
855 * XXX: Support multiple listening sockets (e.g. localhost
856 * resolves to AF_INET and AF_INET6, but only the first address
863 freeaddrinfo(result);
866 /* All bind()s failed */
869 #endif /* ndef HAVE_RFC2553 */
871 while (listen(fd, MAX_LISTEN_BACKLOG) == -1)
885 /*********************************************************************
887 * Function : get_host_information
889 * Description : Determines the IP address the client used to
890 * reach us and the hostname associated with it.
892 * XXX: Most of the code has been copy and pasted
893 * from accept_connection() and not all of the
894 * ifdefs paths have been tested afterwards.
897 * 1 : afd = File descriptor returned from accept().
898 * 2 : ip_address = Pointer to return the pointer to
899 * the ip address string.
900 * 3 : hostname = Pointer to return the pointer to
901 * the hostname or NULL if the caller
902 * isn't interested in it.
906 *********************************************************************/
907 void get_host_information(jb_socket afd, char **ip_address, char **hostname)
910 struct sockaddr_storage server;
913 struct sockaddr_in server;
914 struct hostent *host = NULL;
915 #endif /* HAVE_RFC2553 */
916 #if defined(_WIN32) || defined(__OS2__) || defined(__APPLE_CC__) || defined(AMIGA)
917 /* according to accept_connection() this fixes a warning. */
918 int s_length, s_length_provided;
920 socklen_t s_length, s_length_provided;
923 #if defined(HAVE_GETHOSTBYADDR_R_8_ARGS) || defined(HAVE_GETHOSTBYADDR_R_7_ARGS) || defined(HAVE_GETHOSTBYADDR_R_5_ARGS)
924 struct hostent result;
925 #if defined(HAVE_GETHOSTBYADDR_R_5_ARGS)
926 struct hostent_data hdata;
928 char hbuf[HOSTENT_BUFFER_SIZE];
930 #endif /* def HAVE_GETHOSTBYADDR_R_5_ARGS */
931 #endif /* def HAVE_GETHOSTBYADDR_R_(8|7|5)_ARGS */
932 #endif /* ifndef HAVE_RFC2553 */
933 s_length = s_length_provided = sizeof(server);
935 if (NULL != hostname)
941 if (!getsockname(afd, (struct sockaddr *) &server, &s_length))
943 if (s_length > s_length_provided)
945 log_error(LOG_LEVEL_ERROR, "getsockname() truncated server address");
949 *ip_address = malloc(NI_MAXHOST);
950 if (NULL == *ip_address)
952 log_error(LOG_LEVEL_ERROR,
953 "Out of memory while getting the client's IP address.");
956 retval = getnameinfo((struct sockaddr *) &server, s_length,
957 *ip_address, NI_MAXHOST, NULL, 0, NI_NUMERICHOST);
960 log_error(LOG_LEVEL_ERROR,
961 "Unable to print my own IP address: %s", gai_strerror(retval));
966 *ip_address = strdup(inet_ntoa(server.sin_addr));
967 #endif /* HAVE_RFC2553 */
968 if (NULL == hostname)
971 * We're done here, the caller isn't
972 * interested in knowing the hostname.
978 *hostname = malloc(NI_MAXHOST);
979 if (NULL == *hostname)
981 log_error(LOG_LEVEL_ERROR,
982 "Out of memory while getting the client's hostname.");
985 retval = getnameinfo((struct sockaddr *) &server, s_length,
986 *hostname, NI_MAXHOST, NULL, 0, NI_NAMEREQD);
989 log_error(LOG_LEVEL_ERROR,
990 "Unable to resolve my own IP address: %s", gai_strerror(retval));
994 #if defined(HAVE_GETHOSTBYADDR_R_8_ARGS)
995 gethostbyaddr_r((const char *)&server.sin_addr,
996 sizeof(server.sin_addr), AF_INET,
997 &result, hbuf, HOSTENT_BUFFER_SIZE,
999 #elif defined(HAVE_GETHOSTBYADDR_R_7_ARGS)
1000 host = gethostbyaddr_r((const char *)&server.sin_addr,
1001 sizeof(server.sin_addr), AF_INET,
1002 &result, hbuf, HOSTENT_BUFFER_SIZE, &thd_err);
1003 #elif defined(HAVE_GETHOSTBYADDR_R_5_ARGS)
1004 if (0 == gethostbyaddr_r((const char *)&server.sin_addr,
1005 sizeof(server.sin_addr), AF_INET,
1014 #elif defined(MUTEX_LOCKS_AVAILABLE)
1015 privoxy_mutex_lock(&resolver_mutex);
1016 host = gethostbyaddr((const char *)&server.sin_addr,
1017 sizeof(server.sin_addr), AF_INET);
1018 privoxy_mutex_unlock(&resolver_mutex);
1020 host = gethostbyaddr((const char *)&server.sin_addr,
1021 sizeof(server.sin_addr), AF_INET);
1025 log_error(LOG_LEVEL_ERROR, "Unable to get my own hostname: %E\n");
1029 *hostname = strdup(host->h_name);
1031 #endif /* else def HAVE_RFC2553 */
1038 /*********************************************************************
1040 * Function : accept_connection
1042 * Description : Accepts a connection on a socket. Socket must have
1043 * been created using bind_port().
1046 * 1 : csp = Client state, cfd, ip_addr_str, and
1047 * ip_addr_long will be set by this routine.
1048 * 2 : fd = file descriptor returned from bind_port
1050 * Returns : when a connection is accepted, it returns 1 (TRUE).
1051 * On an error it returns 0 (FALSE).
1053 *********************************************************************/
1054 int accept_connection(struct client_state * csp, jb_socket fd)
1057 /* XXX: client is stored directly into csp->tcp_addr */
1058 #define client (csp->tcp_addr)
1061 struct sockaddr_in client;
1064 #if defined(_WIN32) || defined(__OS2__) || defined(__APPLE_CC__) || defined(AMIGA)
1065 /* Wierdness - fix a warning. */
1071 c_length = sizeof(client);
1074 afd = accept (fd, (struct sockaddr *) &client, &c_length);
1075 if (afd == JB_INVALID_SOCKET)
1082 #if defined(FEATURE_ACCEPT_FILTER) && defined(SO_ACCEPTFILTER)
1083 struct accept_filter_arg af_options;
1084 bzero(&af_options, sizeof(af_options));
1085 strlcpy(af_options.af_name, "httpready", sizeof(af_options.af_name));
1086 setsockopt(fd, SOL_SOCKET, SO_ACCEPTFILTER, &af_options, sizeof(af_options));
1088 afd = accept (fd, (struct sockaddr *) &client, &c_length);
1089 } while (afd < 1 && errno == EINTR);
1098 csp->ip_addr_str = malloc(NI_MAXHOST);
1099 if (NULL == csp->ip_addr_str)
1101 log_error(LOG_LEVEL_ERROR,
1102 "Out of memory while getting the client's IP address.");
1105 retval = getnameinfo((struct sockaddr *) &client, c_length,
1106 csp->ip_addr_str, NI_MAXHOST, NULL, 0, NI_NUMERICHOST);
1107 if (!csp->ip_addr_str || retval)
1109 log_error(LOG_LEVEL_ERROR, "Can not save csp->ip_addr_str: %s",
1110 (csp->ip_addr_str) ? gai_strerror(retval) : "Insuffcient memory");
1111 freez(csp->ip_addr_str);
1115 csp->ip_addr_str = strdup(inet_ntoa(client.sin_addr));
1116 csp->ip_addr_long = ntohl(client.sin_addr.s_addr);
1117 #endif /* def HAVE_RFC2553 */
1124 /*********************************************************************
1126 * Function : resolve_hostname_to_ip
1128 * Description : Resolve a hostname to an internet tcp/ip address.
1129 * NULL or an empty string resolve to INADDR_ANY.
1132 * 1 : host = hostname to resolve
1134 * Returns : INADDR_NONE => failure, INADDR_ANY or tcp/ip address if succesful.
1136 *********************************************************************/
1137 unsigned long resolve_hostname_to_ip(const char *host)
1139 struct sockaddr_in inaddr;
1140 struct hostent *hostp;
1141 #if defined(HAVE_GETHOSTBYNAME_R_6_ARGS) || defined(HAVE_GETHOSTBYNAME_R_5_ARGS) || defined(HAVE_GETHOSTBYNAME_R_3_ARGS)
1142 struct hostent result;
1143 #if defined(HAVE_GETHOSTBYNAME_R_6_ARGS) || defined(HAVE_GETHOSTBYNAME_R_5_ARGS)
1144 char hbuf[HOSTENT_BUFFER_SIZE];
1146 #else /* defined(HAVE_GETHOSTBYNAME_R_3_ARGS) */
1147 struct hostent_data hdata;
1148 #endif /* def HAVE_GETHOSTBYNAME_R_(6|5)_ARGS */
1149 #endif /* def HAVE_GETHOSTBYNAME_R_(6|5|3)_ARGS */
1151 if ((host == NULL) || (*host == '\0'))
1156 memset((char *) &inaddr, 0, sizeof inaddr);
1158 if ((inaddr.sin_addr.s_addr = inet_addr(host)) == -1)
1160 unsigned int dns_retries = 0;
1161 #if defined(HAVE_GETHOSTBYNAME_R_6_ARGS)
1162 while (gethostbyname_r(host, &result, hbuf,
1163 HOSTENT_BUFFER_SIZE, &hostp, &thd_err)
1164 && (thd_err == TRY_AGAIN) && (dns_retries++ < MAX_DNS_RETRIES))
1166 log_error(LOG_LEVEL_ERROR,
1167 "Timeout #%u while trying to resolve %s. Trying again.",
1170 #elif defined(HAVE_GETHOSTBYNAME_R_5_ARGS)
1171 while (NULL == (hostp = gethostbyname_r(host, &result,
1172 hbuf, HOSTENT_BUFFER_SIZE, &thd_err))
1173 && (thd_err == TRY_AGAIN) && (dns_retries++ < MAX_DNS_RETRIES))
1175 log_error(LOG_LEVEL_ERROR,
1176 "Timeout #%u while trying to resolve %s. Trying again.",
1179 #elif defined(HAVE_GETHOSTBYNAME_R_3_ARGS)
1181 * XXX: Doesn't retry in case of soft errors.
1182 * Does this gethostbyname_r version set h_errno?
1184 if (0 == gethostbyname_r(host, &result, &hdata))
1192 #elif defined(MUTEX_LOCKS_AVAILABLE)
1193 privoxy_mutex_lock(&resolver_mutex);
1194 while (NULL == (hostp = gethostbyname(host))
1195 && (h_errno == TRY_AGAIN) && (dns_retries++ < MAX_DNS_RETRIES))
1197 log_error(LOG_LEVEL_ERROR,
1198 "Timeout #%u while trying to resolve %s. Trying again.",
1201 privoxy_mutex_unlock(&resolver_mutex);
1203 while (NULL == (hostp = gethostbyname(host))
1204 && (h_errno == TRY_AGAIN) && (dns_retries++ < MAX_DNS_RETRIES))
1206 log_error(LOG_LEVEL_ERROR,
1207 "Timeout #%u while trying to resolve %s. Trying again.",
1210 #endif /* def HAVE_GETHOSTBYNAME_R_(6|5|3)_ARGS */
1212 * On Mac OSX, if a domain exists but doesn't have a type A
1213 * record associated with it, the h_addr member of the struct
1214 * hostent returned by gethostbyname is NULL, even if h_length
1215 * is 4. Therefore the second test below.
1217 if (hostp == NULL || hostp->h_addr == NULL)
1220 log_error(LOG_LEVEL_ERROR, "could not resolve hostname %s", host);
1221 return(INADDR_NONE);
1223 if (hostp->h_addrtype != AF_INET)
1226 errno = WSAEPROTOTYPE;
1230 log_error(LOG_LEVEL_ERROR, "hostname %s resolves to unknown address type.", host);
1231 return(INADDR_NONE);
1234 (char *) &inaddr.sin_addr,
1235 (char *) hostp->h_addr,
1236 sizeof(inaddr.sin_addr)
1239 return(inaddr.sin_addr.s_addr);
1244 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
1245 /*********************************************************************
1247 * Function : socket_is_still_alive
1249 * Description : Figures out whether or not a socket is still alive.
1252 * 1 : sfd = The socket to check.
1254 * Returns : TRUE for yes, otherwise FALSE.
1256 *********************************************************************/
1257 int socket_is_still_alive(jb_socket sfd)
1260 int no_data_waiting;
1264 struct pollfd poll_fd[1];
1266 memset(poll_fd, 0, sizeof(poll_fd));
1267 poll_fd[0].fd = sfd;
1268 poll_fd[0].events = POLLIN;
1270 poll_result = poll(poll_fd, 1, 0);
1272 if (-1 == poll_result)
1274 log_error(LOG_LEVEL_CONNECT, "Polling socket %d failed.", sfd);
1277 no_data_waiting = !(poll_fd[0].revents & POLLIN);
1279 fd_set readable_fds;
1280 struct timeval timeout;
1283 memset(&timeout, '\0', sizeof(timeout));
1284 FD_ZERO(&readable_fds);
1285 FD_SET(sfd, &readable_fds);
1287 ret = select((int)sfd+1, &readable_fds, NULL, NULL, &timeout);
1290 log_error(LOG_LEVEL_CONNECT, "select() on socket %d failed: %E", sfd);
1293 no_data_waiting = !FD_ISSET(sfd, &readable_fds);
1294 #endif /* def HAVE_POLL */
1296 return (no_data_waiting || (1 == recv(sfd, buf, 1, MSG_PEEK)));
1298 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */