1 const char jbsockets_rcs[] = "$Id: jbsockets.c,v 1.88 2011/03/27 13:56:27 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__)
186 struct access_control_addr dst[1];
187 #endif /* def FEATURE_ACL */
189 /* Don't leak memory when retrying. */
190 freez(csp->error_message);
191 freez(csp->http->host_ip_addr_str);
193 retval = snprintf(service, sizeof(service), "%d", portnum);
194 if ((-1 == retval) || (sizeof(service) <= retval))
196 log_error(LOG_LEVEL_ERROR,
197 "Port number (%d) ASCII decimal representation doesn't fit into 6 bytes",
199 csp->error_message = strdup("Invalid port number");
200 csp->http->host_ip_addr_str = strdup("unknown");
201 return(JB_INVALID_SOCKET);
204 memset((char *)&hints, 0, sizeof(hints));
205 hints.ai_family = AF_UNSPEC;
206 hints.ai_socktype = SOCK_STREAM;
207 hints.ai_flags = AI_NUMERICSERV; /* avoid service look-up */
209 hints.ai_flags |= AI_ADDRCONFIG;
211 if ((retval = getaddrinfo(host, service, &hints, &result)))
213 log_error(LOG_LEVEL_INFO,
214 "Can not resolve %s: %s", host, gai_strerror(retval));
215 /* XXX: Should find a better way to propagate this error. */
217 csp->error_message = strdup(gai_strerror(retval));
218 csp->http->host_ip_addr_str = strdup("unknown");
219 return(JB_INVALID_SOCKET);
222 csp->http->host_ip_addr_str = malloc(NI_MAXHOST);
223 if (NULL == csp->http->host_ip_addr_str)
225 log_error(LOG_LEVEL_ERROR,
226 "Out of memory while getting the server IP address.");
227 return JB_INVALID_SOCKET;
230 for (rp = result; rp != NULL; rp = rp->ai_next)
234 memcpy(&dst->addr, rp->ai_addr, rp->ai_addrlen);
236 if (block_acl(dst, csp))
239 socket_error = errno = SOCEPERM;
241 socket_error = errno = EPERM;
245 #endif /* def FEATURE_ACL */
247 retval = getnameinfo(rp->ai_addr, rp->ai_addrlen,
248 csp->http->host_ip_addr_str, NI_MAXHOST, NULL, 0, NI_NUMERICHOST);
251 log_error(LOG_LEVEL_ERROR,
252 "Can not save csp->http->host_ip_addr_str: %s",
253 gai_strerror(retval));
258 if ((fd = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol)) ==
261 if ((fd = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol)) < 0)
268 { /* turn off TCP coalescence */
270 setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, (char *) &mi, sizeof (int));
272 #endif /* def TCP_NODELAY */
274 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
275 if ((flags = fcntl(fd, F_GETFL, 0)) != -1)
278 fcntl(fd, F_SETFL, flags);
280 #endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__) */
283 while (connect(fd, rp->ai_addr, rp->ai_addrlen) == JB_INVALID_SOCKET)
286 if (errno == WSAEINPROGRESS)
288 if (sock_errno() == EINPROGRESS)
289 #else /* ifndef _WIN32 */
290 if (errno == EINPROGRESS)
291 #endif /* ndef _WIN32 || __OS2__ */
297 if (sock_errno() != EINTR)
312 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
316 fcntl(fd, F_SETFL, flags);
318 #endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__) */
320 /* wait for connection to complete */
327 /* MS Windows uses int, not SOCKET, for the 1st arg of select(). Wierd! */
328 if ((select((int)fd + 1, NULL, &wfds, NULL, tv) > 0)
329 && FD_ISSET(fd, &wfds))
331 socklen_t optlen = sizeof(socket_error);
332 if (!getsockopt(fd, SOL_SOCKET, SO_ERROR, &socket_error, &optlen))
336 /* Connection established, no need to try other addresses. */
339 log_error(LOG_LEVEL_CONNECT, "Could not connect to [%s]:%s: %s.",
340 csp->http->host_ip_addr_str, service, strerror(socket_error));
344 socket_error = errno;
345 log_error(LOG_LEVEL_ERROR, "Could not get the state of "
346 "the connection to [%s]:%s: %s; dropping connection.",
347 csp->http->host_ip_addr_str, service, strerror(errno));
351 /* Connection failed, try next address */
355 freeaddrinfo(result);
358 log_error(LOG_LEVEL_CONNECT, "Could not connect to [%s]:%s: %s.",
359 host, service, strerror(socket_error));
360 csp->error_message = strdup(strerror(socket_error));
361 return(JB_INVALID_SOCKET);
363 log_error(LOG_LEVEL_CONNECT, "Connected to %s[%s]:%s.",
364 host, csp->http->host_ip_addr_str, service);
370 #else /* ndef HAVE_RFC2553 */
371 /* Pre-getaddrinfo implementation */
373 static jb_socket no_rfc2553_connect_to(const char *host, int portnum, struct client_state *csp)
375 struct sockaddr_in inaddr;
379 struct timeval tv[1];
380 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
385 struct access_control_addr dst[1];
386 #endif /* def FEATURE_ACL */
388 /* Don't leak memory when retrying. */
389 freez(csp->http->host_ip_addr_str);
391 memset((char *)&inaddr, 0, sizeof inaddr);
393 if ((addr = resolve_hostname_to_ip(host)) == INADDR_NONE)
395 csp->http->host_ip_addr_str = strdup("unknown");
396 return(JB_INVALID_SOCKET);
400 dst->addr = ntohl(addr);
403 if (block_acl(dst, csp))
410 return(JB_INVALID_SOCKET);
412 #endif /* def FEATURE_ACL */
414 inaddr.sin_addr.s_addr = addr;
415 inaddr.sin_family = AF_INET;
416 csp->http->host_ip_addr_str = strdup(inet_ntoa(inaddr.sin_addr));
419 if (sizeof(inaddr.sin_port) == sizeof(short))
420 #endif /* ndef _WIN32 */
422 inaddr.sin_port = htons((unsigned short) portnum);
427 inaddr.sin_port = htonl((unsigned long)portnum);
429 #endif /* ndef _WIN32 */
432 if ((fd = socket(inaddr.sin_family, SOCK_STREAM, 0)) == JB_INVALID_SOCKET)
434 if ((fd = socket(inaddr.sin_family, SOCK_STREAM, 0)) < 0)
437 return(JB_INVALID_SOCKET);
441 { /* turn off TCP coalescence */
443 setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, (char *) &mi, sizeof (int));
445 #endif /* def TCP_NODELAY */
447 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
448 if ((flags = fcntl(fd, F_GETFL, 0)) != -1)
451 fcntl(fd, F_SETFL, flags);
453 #endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__) */
455 while (connect(fd, (struct sockaddr *) & inaddr, sizeof inaddr) == JB_INVALID_SOCKET)
458 if (errno == WSAEINPROGRESS)
460 if (sock_errno() == EINPROGRESS)
461 #else /* ifndef _WIN32 */
462 if (errno == EINPROGRESS)
463 #endif /* ndef _WIN32 || __OS2__ */
469 if (sock_errno() != EINTR)
475 return(JB_INVALID_SOCKET);
479 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
483 fcntl(fd, F_SETFL, flags);
485 #endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__) */
487 /* wait for connection to complete */
494 /* MS Windows uses int, not SOCKET, for the 1st arg of select(). Wierd! */
495 if (select((int)fd + 1, NULL, &wfds, NULL, tv) <= 0)
498 return(JB_INVALID_SOCKET);
503 #endif /* ndef HAVE_RFC2553 */
506 /*********************************************************************
508 * Function : write_socket
510 * Description : Write the contents of buf (for n bytes) to socket fd.
513 * 1 : fd = file descriptor (aka. handle) of socket to write to.
514 * 2 : buf = pointer to data to be written.
515 * 3 : len = length of data to be written to the socket "fd".
517 * Returns : 0 on success (entire buffer sent).
520 *********************************************************************/
522 int write_socket(jb_socket fd, const char *buf, ssize_t len)
524 int write_socket(jb_socket fd, const char *buf, size_t len)
532 if (len < 0) /* constant condition - size_t isn't ever negative */
537 log_error(LOG_LEVEL_WRITING, "to socket %d: %N", fd, len, buf);
540 return (send(fd, buf, (int)len, 0) != (int)len);
541 #elif defined(__BEOS__) || defined(AMIGA)
542 return (send(fd, buf, len, 0) != len);
543 #elif defined(__OS2__)
545 * Break the data up into SOCKET_SEND_MAX chunks for sending...
546 * OS/2 seemed to complain when the chunks were too large.
548 #define SOCKET_SEND_MAX 65000
550 int send_len, send_rc = 0, i = 0;
551 while ((i < len) && (send_rc != -1))
553 if ((i + SOCKET_SEND_MAX) > len)
556 send_len = SOCKET_SEND_MAX;
557 send_rc = send(fd,(char*)buf + i, send_len, 0);
565 return (write(fd, buf, len) != len);
571 /*********************************************************************
573 * Function : read_socket
575 * Description : Read from a TCP/IP socket in a platform independent way.
578 * 1 : fd = file descriptor of the socket to read
579 * 2 : buf = pointer to buffer where data will be written
580 * Must be >= len bytes long.
581 * 3 : len = maximum number of bytes to read
583 * Returns : On success, the number of bytes read is returned (zero
584 * indicates end of file), and the file position is advanced
585 * by this number. It is not an error if this number is
586 * smaller than the number of bytes requested; this may hap-
587 * pen for example because fewer bytes are actually available
588 * right now (maybe because we were close to end-of-file, or
589 * because we are reading from a pipe, or from a terminal,
590 * or because read() was interrupted by a signal). On error,
591 * -1 is returned, and errno is set appropriately. In this
592 * case it is left unspecified whether the file position (if
595 *********************************************************************/
596 int read_socket(jb_socket fd, char *buf, int len)
606 ret = recv(fd, buf, len, 0);
607 #elif defined(__BEOS__) || defined(AMIGA) || defined(__OS2__)
608 ret = recv(fd, buf, (size_t)len, 0);
610 ret = (int)read(fd, buf, (size_t)len);
615 log_error(LOG_LEVEL_RECEIVED, "from socket %d: %N", fd, ret, buf);
622 /*********************************************************************
624 * Function : data_is_available
626 * Description : Waits for data to arrive on a socket.
629 * 1 : fd = file descriptor of the socket to read
630 * 2 : seconds_to_wait = number of seconds after which we give up.
632 * Returns : TRUE if data arrived in time,
635 *********************************************************************/
636 int data_is_available(jb_socket fd, int seconds_to_wait)
640 struct timeval timeout;
643 memset(&timeout, 0, sizeof(timeout));
644 timeout.tv_sec = seconds_to_wait;
647 /* Copy and pasted from jcc.c ... */
648 memset(&rfds, 0, sizeof(fd_set));
654 n = select(fd+1, &rfds, NULL, NULL, &timeout);
657 * XXX: Do we care about the different error conditions?
659 return ((n == 1) && (1 == recv(fd, buf, 1, MSG_PEEK)));
663 /*********************************************************************
665 * Function : close_socket
667 * Description : Closes a TCP/IP socket
670 * 1 : fd = file descriptor of socket to be closed
674 *********************************************************************/
675 void close_socket(jb_socket fd)
677 #if defined(_WIN32) || defined(__BEOS__)
681 #elif defined(__OS2__)
690 /*********************************************************************
692 * Function : bind_port
694 * Description : Call socket, set socket options, and listen.
695 * Called by listen_loop to "boot up" our proxy address.
698 * 1 : hostnam = TCP/IP address to bind/listen to
699 * 2 : portnum = port to listen on
700 * 3 : pfd = pointer used to return file descriptor.
702 * Returns : if success, returns 0 and sets *pfd.
703 * if failure, returns -3 if address is in use,
704 * -2 if address unresolvable,
706 *********************************************************************/
707 int bind_port(const char *hostnam, int portnum, jb_socket *pfd)
710 struct addrinfo hints;
711 struct addrinfo *result, *rp;
713 * XXX: portnum should be a string to allow symbolic service
714 * names in the configuration file and to avoid the following
720 struct sockaddr_in inaddr;
721 #endif /* def HAVE_RFC2553 */
725 #endif /* ndef _WIN32 */
727 *pfd = JB_INVALID_SOCKET;
730 retval = snprintf(servnam, sizeof(servnam), "%d", portnum);
731 if ((-1 == retval) || (sizeof(servnam) <= retval))
733 log_error(LOG_LEVEL_ERROR,
734 "Port number (%d) ASCII decimal representation doesn't fit into 6 bytes",
739 memset(&hints, 0, sizeof(struct addrinfo));
743 * XXX: This is a hack. The right thing to do
744 * would be to bind to both AF_INET and AF_INET6.
745 * This will also fail if there is no AF_INET
748 hints.ai_family = AF_INET;
752 hints.ai_family = AF_UNSPEC;
754 hints.ai_socktype = SOCK_STREAM;
755 hints.ai_flags = AI_PASSIVE;
757 hints.ai_flags |= AI_ADDRCONFIG;
759 hints.ai_protocol = 0; /* Realy any stream protocol or TCP only */
760 hints.ai_canonname = NULL;
761 hints.ai_addr = NULL;
762 hints.ai_next = NULL;
764 if ((retval = getaddrinfo(hostnam, servnam, &hints, &result)))
766 log_error(LOG_LEVEL_ERROR,
767 "Can not resolve %s: %s", hostnam, gai_strerror(retval));
771 memset((char *)&inaddr, '\0', sizeof inaddr);
773 inaddr.sin_family = AF_INET;
774 inaddr.sin_addr.s_addr = resolve_hostname_to_ip(hostnam);
776 if (inaddr.sin_addr.s_addr == INADDR_NONE)
782 if (sizeof(inaddr.sin_port) == sizeof(short))
783 #endif /* ndef _WIN32 */
785 inaddr.sin_port = htons((unsigned short) portnum);
790 inaddr.sin_port = htonl((unsigned long) portnum);
792 #endif /* ndef _WIN32 */
793 #endif /* def HAVE_RFC2553 */
796 for (rp = result; rp != NULL; rp = rp->ai_next)
798 fd = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol);
800 fd = socket(AF_INET, SOCK_STREAM, 0);
801 #endif /* def HAVE_RFC2553 */
804 if (fd == JB_INVALID_SOCKET)
818 * This is not needed for Win32 - in fact, it stops
819 * duplicate instances of Privoxy from being caught.
821 * On UNIX, we assume the user is sensible enough not
822 * to start Privoxy multiple times on the same IP.
823 * Without this, stopping and restarting Privoxy
824 * from a script fails.
825 * Note: SO_REUSEADDR is meant to only take over
826 * sockets which are *not* in listen state in Linux,
827 * e.g. sockets in TIME_WAIT. YMMV.
829 setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char *)&one, sizeof(one));
830 #endif /* ndef _WIN32 */
833 if (bind(fd, rp->ai_addr, rp->ai_addrlen) < 0)
835 if (bind(fd, (struct sockaddr *)&inaddr, sizeof(inaddr)) < 0)
839 errno = WSAGetLastError();
840 if (errno == WSAEADDRINUSE)
842 if (errno == EADDRINUSE)
846 freeaddrinfo(result);
863 /* bind() succeeded, escape from for-loop */
865 * XXX: Support multiple listening sockets (e.g. localhost
866 * resolves to AF_INET and AF_INET6, but only the first address
873 freeaddrinfo(result);
876 /* All bind()s failed */
879 #endif /* ndef HAVE_RFC2553 */
881 while (listen(fd, MAX_LISTEN_BACKLOG) == -1)
895 /*********************************************************************
897 * Function : get_host_information
899 * Description : Determines the IP address the client used to
900 * reach us and the hostname associated with it.
902 * XXX: Most of the code has been copy and pasted
903 * from accept_connection() and not all of the
904 * ifdefs paths have been tested afterwards.
907 * 1 : afd = File descriptor returned from accept().
908 * 2 : ip_address = Pointer to return the pointer to
909 * the ip address string.
910 * 3 : hostname = Pointer to return the pointer to
911 * the hostname or NULL if the caller
912 * isn't interested in it.
916 *********************************************************************/
917 void get_host_information(jb_socket afd, char **ip_address, char **hostname)
920 struct sockaddr_storage server;
923 struct sockaddr_in server;
924 struct hostent *host = NULL;
925 #endif /* HAVE_RFC2553 */
926 #if defined(_WIN32) || defined(__OS2__) || defined(__APPLE_CC__) || defined(AMIGA)
927 /* according to accept_connection() this fixes a warning. */
928 int s_length, s_length_provided;
930 socklen_t s_length, s_length_provided;
933 #if defined(HAVE_GETHOSTBYADDR_R_8_ARGS) || defined(HAVE_GETHOSTBYADDR_R_7_ARGS) || defined(HAVE_GETHOSTBYADDR_R_5_ARGS)
934 struct hostent result;
935 #if defined(HAVE_GETHOSTBYADDR_R_5_ARGS)
936 struct hostent_data hdata;
938 char hbuf[HOSTENT_BUFFER_SIZE];
940 #endif /* def HAVE_GETHOSTBYADDR_R_5_ARGS */
941 #endif /* def HAVE_GETHOSTBYADDR_R_(8|7|5)_ARGS */
942 #endif /* ifndef HAVE_RFC2553 */
943 s_length = s_length_provided = sizeof(server);
945 if (NULL != hostname)
951 if (!getsockname(afd, (struct sockaddr *) &server, &s_length))
953 if (s_length > s_length_provided)
955 log_error(LOG_LEVEL_ERROR, "getsockname() truncated server address");
959 *ip_address = malloc(NI_MAXHOST);
960 if (NULL == *ip_address)
962 log_error(LOG_LEVEL_ERROR,
963 "Out of memory while getting the client's IP address.");
966 retval = getnameinfo((struct sockaddr *) &server, s_length,
967 *ip_address, NI_MAXHOST, NULL, 0, NI_NUMERICHOST);
970 log_error(LOG_LEVEL_ERROR,
971 "Unable to print my own IP address: %s", gai_strerror(retval));
976 *ip_address = strdup(inet_ntoa(server.sin_addr));
977 #endif /* HAVE_RFC2553 */
978 if (NULL == hostname)
981 * We're done here, the caller isn't
982 * interested in knowing the hostname.
988 *hostname = malloc(NI_MAXHOST);
989 if (NULL == *hostname)
991 log_error(LOG_LEVEL_ERROR,
992 "Out of memory while getting the client's hostname.");
995 retval = getnameinfo((struct sockaddr *) &server, s_length,
996 *hostname, NI_MAXHOST, NULL, 0, NI_NAMEREQD);
999 log_error(LOG_LEVEL_ERROR,
1000 "Unable to resolve my own IP address: %s", gai_strerror(retval));
1004 #if defined(HAVE_GETHOSTBYADDR_R_8_ARGS)
1005 gethostbyaddr_r((const char *)&server.sin_addr,
1006 sizeof(server.sin_addr), AF_INET,
1007 &result, hbuf, HOSTENT_BUFFER_SIZE,
1009 #elif defined(HAVE_GETHOSTBYADDR_R_7_ARGS)
1010 host = gethostbyaddr_r((const char *)&server.sin_addr,
1011 sizeof(server.sin_addr), AF_INET,
1012 &result, hbuf, HOSTENT_BUFFER_SIZE, &thd_err);
1013 #elif defined(HAVE_GETHOSTBYADDR_R_5_ARGS)
1014 if (0 == gethostbyaddr_r((const char *)&server.sin_addr,
1015 sizeof(server.sin_addr), AF_INET,
1024 #elif defined(MUTEX_LOCKS_AVAILABLE)
1025 privoxy_mutex_lock(&resolver_mutex);
1026 host = gethostbyaddr((const char *)&server.sin_addr,
1027 sizeof(server.sin_addr), AF_INET);
1028 privoxy_mutex_unlock(&resolver_mutex);
1030 host = gethostbyaddr((const char *)&server.sin_addr,
1031 sizeof(server.sin_addr), AF_INET);
1035 log_error(LOG_LEVEL_ERROR, "Unable to get my own hostname: %E\n");
1039 *hostname = strdup(host->h_name);
1041 #endif /* else def HAVE_RFC2553 */
1048 /*********************************************************************
1050 * Function : accept_connection
1052 * Description : Accepts a connection on a socket. Socket must have
1053 * been created using bind_port().
1056 * 1 : csp = Client state, cfd, ip_addr_str, and
1057 * ip_addr_long will be set by this routine.
1058 * 2 : fd = file descriptor returned from bind_port
1060 * Returns : when a connection is accepted, it returns 1 (TRUE).
1061 * On an error it returns 0 (FALSE).
1063 *********************************************************************/
1064 int accept_connection(struct client_state * csp, jb_socket fd)
1067 /* XXX: client is stored directly into csp->tcp_addr */
1068 #define client (csp->tcp_addr)
1071 struct sockaddr_in client;
1074 #if defined(_WIN32) || defined(__OS2__) || defined(__APPLE_CC__) || defined(AMIGA)
1075 /* Wierdness - fix a warning. */
1081 c_length = sizeof(client);
1084 afd = accept (fd, (struct sockaddr *) &client, &c_length);
1085 if (afd == JB_INVALID_SOCKET)
1092 #if defined(FEATURE_ACCEPT_FILTER) && defined(SO_ACCEPTFILTER)
1093 struct accept_filter_arg af_options;
1094 bzero(&af_options, sizeof(af_options));
1095 strlcpy(af_options.af_name, "httpready", sizeof(af_options.af_name));
1096 setsockopt(fd, SOL_SOCKET, SO_ACCEPTFILTER, &af_options, sizeof(af_options));
1098 afd = accept (fd, (struct sockaddr *) &client, &c_length);
1099 } while (afd < 1 && errno == EINTR);
1108 csp->ip_addr_str = malloc(NI_MAXHOST);
1109 if (NULL == csp->ip_addr_str)
1111 log_error(LOG_LEVEL_ERROR,
1112 "Out of memory while getting the client's IP address.");
1115 retval = getnameinfo((struct sockaddr *) &client, c_length,
1116 csp->ip_addr_str, NI_MAXHOST, NULL, 0, NI_NUMERICHOST);
1117 if (!csp->ip_addr_str || retval)
1119 log_error(LOG_LEVEL_ERROR, "Can not save csp->ip_addr_str: %s",
1120 (csp->ip_addr_str) ? gai_strerror(retval) : "Insuffcient memory");
1121 freez(csp->ip_addr_str);
1125 csp->ip_addr_str = strdup(inet_ntoa(client.sin_addr));
1126 csp->ip_addr_long = ntohl(client.sin_addr.s_addr);
1127 #endif /* def HAVE_RFC2553 */
1134 /*********************************************************************
1136 * Function : resolve_hostname_to_ip
1138 * Description : Resolve a hostname to an internet tcp/ip address.
1139 * NULL or an empty string resolve to INADDR_ANY.
1142 * 1 : host = hostname to resolve
1144 * Returns : INADDR_NONE => failure, INADDR_ANY or tcp/ip address if succesful.
1146 *********************************************************************/
1147 unsigned long resolve_hostname_to_ip(const char *host)
1149 struct sockaddr_in inaddr;
1150 struct hostent *hostp;
1151 #if defined(HAVE_GETHOSTBYNAME_R_6_ARGS) || defined(HAVE_GETHOSTBYNAME_R_5_ARGS) || defined(HAVE_GETHOSTBYNAME_R_3_ARGS)
1152 struct hostent result;
1153 #if defined(HAVE_GETHOSTBYNAME_R_6_ARGS) || defined(HAVE_GETHOSTBYNAME_R_5_ARGS)
1154 char hbuf[HOSTENT_BUFFER_SIZE];
1156 #else /* defined(HAVE_GETHOSTBYNAME_R_3_ARGS) */
1157 struct hostent_data hdata;
1158 #endif /* def HAVE_GETHOSTBYNAME_R_(6|5)_ARGS */
1159 #endif /* def HAVE_GETHOSTBYNAME_R_(6|5|3)_ARGS */
1161 if ((host == NULL) || (*host == '\0'))
1166 memset((char *) &inaddr, 0, sizeof inaddr);
1168 if ((inaddr.sin_addr.s_addr = inet_addr(host)) == -1)
1170 unsigned int dns_retries = 0;
1171 #if defined(HAVE_GETHOSTBYNAME_R_6_ARGS)
1172 while (gethostbyname_r(host, &result, hbuf,
1173 HOSTENT_BUFFER_SIZE, &hostp, &thd_err)
1174 && (thd_err == TRY_AGAIN) && (dns_retries++ < MAX_DNS_RETRIES))
1176 log_error(LOG_LEVEL_ERROR,
1177 "Timeout #%u while trying to resolve %s. Trying again.",
1180 #elif defined(HAVE_GETHOSTBYNAME_R_5_ARGS)
1181 while (NULL == (hostp = gethostbyname_r(host, &result,
1182 hbuf, HOSTENT_BUFFER_SIZE, &thd_err))
1183 && (thd_err == TRY_AGAIN) && (dns_retries++ < MAX_DNS_RETRIES))
1185 log_error(LOG_LEVEL_ERROR,
1186 "Timeout #%u while trying to resolve %s. Trying again.",
1189 #elif defined(HAVE_GETHOSTBYNAME_R_3_ARGS)
1191 * XXX: Doesn't retry in case of soft errors.
1192 * Does this gethostbyname_r version set h_errno?
1194 if (0 == gethostbyname_r(host, &result, &hdata))
1202 #elif defined(MUTEX_LOCKS_AVAILABLE)
1203 privoxy_mutex_lock(&resolver_mutex);
1204 while (NULL == (hostp = gethostbyname(host))
1205 && (h_errno == TRY_AGAIN) && (dns_retries++ < MAX_DNS_RETRIES))
1207 log_error(LOG_LEVEL_ERROR,
1208 "Timeout #%u while trying to resolve %s. Trying again.",
1211 privoxy_mutex_unlock(&resolver_mutex);
1213 while (NULL == (hostp = gethostbyname(host))
1214 && (h_errno == TRY_AGAIN) && (dns_retries++ < MAX_DNS_RETRIES))
1216 log_error(LOG_LEVEL_ERROR,
1217 "Timeout #%u while trying to resolve %s. Trying again.",
1220 #endif /* def HAVE_GETHOSTBYNAME_R_(6|5|3)_ARGS */
1222 * On Mac OSX, if a domain exists but doesn't have a type A
1223 * record associated with it, the h_addr member of the struct
1224 * hostent returned by gethostbyname is NULL, even if h_length
1225 * is 4. Therefore the second test below.
1227 if (hostp == NULL || hostp->h_addr == NULL)
1230 log_error(LOG_LEVEL_ERROR, "could not resolve hostname %s", host);
1231 return(INADDR_NONE);
1233 if (hostp->h_addrtype != AF_INET)
1236 errno = WSAEPROTOTYPE;
1240 log_error(LOG_LEVEL_ERROR, "hostname %s resolves to unknown address type.", host);
1241 return(INADDR_NONE);
1244 (char *) &inaddr.sin_addr,
1245 (char *) hostp->h_addr,
1246 sizeof(inaddr.sin_addr)
1249 return(inaddr.sin_addr.s_addr);
1254 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
1255 /*********************************************************************
1257 * Function : socket_is_still_alive
1259 * Description : Figures out whether or not a socket is still alive.
1262 * 1 : sfd = The socket to check.
1264 * Returns : TRUE for yes, otherwise FALSE.
1266 *********************************************************************/
1267 int socket_is_still_alive(jb_socket sfd)
1270 int no_data_waiting;
1274 struct pollfd poll_fd[1];
1276 memset(poll_fd, 0, sizeof(poll_fd));
1277 poll_fd[0].fd = sfd;
1278 poll_fd[0].events = POLLIN;
1280 poll_result = poll(poll_fd, 1, 0);
1282 if (-1 == poll_result)
1284 log_error(LOG_LEVEL_CONNECT, "Polling socket %d failed.", sfd);
1287 no_data_waiting = !(poll_fd[0].revents & POLLIN);
1289 fd_set readable_fds;
1290 struct timeval timeout;
1293 memset(&timeout, '\0', sizeof(timeout));
1294 FD_ZERO(&readable_fds);
1295 FD_SET(sfd, &readable_fds);
1297 ret = select((int)sfd+1, &readable_fds, NULL, NULL, &timeout);
1300 log_error(LOG_LEVEL_CONNECT, "select() on socket %d failed: %E", sfd);
1303 no_data_waiting = !FD_ISSET(sfd, &readable_fds);
1304 #endif /* def HAVE_POLL */
1306 return (no_data_waiting || (1 == recv(sfd, buf, 1, MSG_PEEK)));
1308 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */