1 const char jbsockets_rcs[] = "$Id: jbsockets.c,v 1.95 2011/03/27 14:03:25 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) 2001-2011 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 * XXX: The whole errno overloading is ridiculous and should
152 * be replaced with something sane and thread safe
156 fd = rfc2553_connect_to(host, portnum, csp);
158 fd = no_rfc2553_connect_to(host, portnum, csp);
160 if ((fd != JB_INVALID_SOCKET) || (errno != EINVAL))
164 forwarded_connect_retries++;
165 log_error(LOG_LEVEL_ERROR,
166 "Attempt %d of %d to connect to %s failed. Trying again.",
167 forwarded_connect_retries, csp->config->forwarded_connect_retries, host);
169 } while (forwarded_connect_retries < csp->config->forwarded_connect_retries);
175 /* Getaddrinfo implementation */
176 static jb_socket rfc2553_connect_to(const char *host, int portnum, struct client_state *csp)
178 struct addrinfo hints, *result, *rp;
183 struct timeval timeout;
184 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
189 * XXX: Initializeing it here is only necessary
190 * because not all situations are properly
193 int socket_error = 0;
196 struct access_control_addr dst[1];
197 #endif /* def FEATURE_ACL */
199 /* Don't leak memory when retrying. */
200 freez(csp->error_message);
201 freez(csp->http->host_ip_addr_str);
203 retval = snprintf(service, sizeof(service), "%d", portnum);
204 if ((-1 == retval) || (sizeof(service) <= retval))
206 log_error(LOG_LEVEL_ERROR,
207 "Port number (%d) ASCII decimal representation doesn't fit into 6 bytes",
209 csp->error_message = strdup("Invalid port number");
210 csp->http->host_ip_addr_str = strdup("unknown");
211 return(JB_INVALID_SOCKET);
214 memset((char *)&hints, 0, sizeof(hints));
215 hints.ai_family = AF_UNSPEC;
216 hints.ai_socktype = SOCK_STREAM;
217 hints.ai_flags = AI_NUMERICSERV; /* avoid service look-up */
219 hints.ai_flags |= AI_ADDRCONFIG;
221 if ((retval = getaddrinfo(host, service, &hints, &result)))
223 log_error(LOG_LEVEL_INFO,
224 "Can not resolve %s: %s", host, gai_strerror(retval));
225 /* XXX: Should find a better way to propagate this error. */
227 csp->error_message = strdup(gai_strerror(retval));
228 csp->http->host_ip_addr_str = strdup("unknown");
229 return(JB_INVALID_SOCKET);
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;
240 for (rp = result; rp != NULL; rp = rp->ai_next)
244 memcpy(&dst->addr, rp->ai_addr, rp->ai_addrlen);
246 if (block_acl(dst, csp))
249 socket_error = errno = SOCEPERM;
251 socket_error = errno = EPERM;
255 #endif /* def FEATURE_ACL */
257 retval = getnameinfo(rp->ai_addr, rp->ai_addrlen,
258 csp->http->host_ip_addr_str, NI_MAXHOST, NULL, 0, NI_NUMERICHOST);
261 log_error(LOG_LEVEL_ERROR,
262 "Failed to get the host name from the socket structure: %s",
263 gai_strerror(retval));
267 fd = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol);
269 if (fd == JB_INVALID_SOCKET)
278 { /* turn off TCP coalescence */
280 setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, (char *) &mi, sizeof (int));
282 #endif /* def TCP_NODELAY */
284 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
285 if ((flags = fcntl(fd, F_GETFL, 0)) != -1)
288 fcntl(fd, F_SETFL, flags);
290 #endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__) */
293 while (connect(fd, rp->ai_addr, rp->ai_addrlen) == JB_INVALID_SOCKET)
296 errno = sock_errno();
300 if (errno == WSAEINPROGRESS)
301 #else /* ifndef _WIN32 */
302 if (errno == EINPROGRESS)
303 #endif /* ndef _WIN32 || __OS2__ */
320 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
324 fcntl(fd, F_SETFL, flags);
326 #endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__) */
328 /* wait for connection to complete */
332 memset(&timeout, 0, sizeof(timeout));
335 /* MS Windows uses int, not SOCKET, for the 1st arg of select(). Wierd! */
336 if ((select((int)fd + 1, NULL, &wfds, NULL, &timeout) > 0)
337 && FD_ISSET(fd, &wfds))
339 socklen_t optlen = sizeof(socket_error);
340 if (!getsockopt(fd, SOL_SOCKET, SO_ERROR, &socket_error, &optlen))
344 /* Connection established, no need to try other addresses. */
347 log_error(LOG_LEVEL_CONNECT, "Could not connect to [%s]:%s: %s.",
348 csp->http->host_ip_addr_str, service, strerror(socket_error));
352 socket_error = errno;
353 log_error(LOG_LEVEL_ERROR, "Could not get the state of "
354 "the connection to [%s]:%s: %s; dropping connection.",
355 csp->http->host_ip_addr_str, service, strerror(errno));
359 /* Connection failed, try next address */
363 freeaddrinfo(result);
366 log_error(LOG_LEVEL_CONNECT, "Could not connect to [%s]:%s: %s.",
367 host, service, strerror(socket_error));
368 csp->error_message = strdup(strerror(socket_error));
369 return(JB_INVALID_SOCKET);
371 log_error(LOG_LEVEL_CONNECT, "Connected to %s[%s]:%s.",
372 host, csp->http->host_ip_addr_str, service);
378 #else /* ndef HAVE_RFC2553 */
379 /* Pre-getaddrinfo implementation */
381 static jb_socket no_rfc2553_connect_to(const char *host, int portnum, struct client_state *csp)
383 struct sockaddr_in inaddr;
387 struct timeval tv[1];
388 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
393 struct access_control_addr dst[1];
394 #endif /* def FEATURE_ACL */
396 /* Don't leak memory when retrying. */
397 freez(csp->http->host_ip_addr_str);
399 memset((char *)&inaddr, 0, sizeof inaddr);
401 if ((addr = resolve_hostname_to_ip(host)) == INADDR_NONE)
403 csp->http->host_ip_addr_str = strdup("unknown");
404 return(JB_INVALID_SOCKET);
408 dst->addr = ntohl(addr);
411 if (block_acl(dst, csp))
418 return(JB_INVALID_SOCKET);
420 #endif /* def FEATURE_ACL */
422 inaddr.sin_addr.s_addr = addr;
423 inaddr.sin_family = AF_INET;
424 csp->http->host_ip_addr_str = strdup(inet_ntoa(inaddr.sin_addr));
427 if (sizeof(inaddr.sin_port) == sizeof(short))
428 #endif /* ndef _WIN32 */
430 inaddr.sin_port = htons((unsigned short) portnum);
435 inaddr.sin_port = htonl((unsigned long)portnum);
437 #endif /* ndef _WIN32 */
439 fd = socket(inaddr.sin_family, SOCK_STREAM, 0);
441 if (fd == JB_INVALID_SOCKET)
446 return(JB_INVALID_SOCKET);
450 { /* turn off TCP coalescence */
452 setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, (char *) &mi, sizeof (int));
454 #endif /* def TCP_NODELAY */
456 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
457 if ((flags = fcntl(fd, F_GETFL, 0)) != -1)
460 fcntl(fd, F_SETFL, flags);
462 #endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__) */
464 while (connect(fd, (struct sockaddr *) & inaddr, sizeof inaddr) == JB_INVALID_SOCKET)
467 if (errno == WSAEINPROGRESS)
469 if (sock_errno() == EINPROGRESS)
470 #else /* ifndef _WIN32 */
471 if (errno == EINPROGRESS)
472 #endif /* ndef _WIN32 || __OS2__ */
478 if (sock_errno() != EINTR)
484 return(JB_INVALID_SOCKET);
488 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
492 fcntl(fd, F_SETFL, flags);
494 #endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__) */
496 /* wait for connection to complete */
503 /* MS Windows uses int, not SOCKET, for the 1st arg of select(). Wierd! */
504 if (select((int)fd + 1, NULL, &wfds, NULL, tv) <= 0)
507 return(JB_INVALID_SOCKET);
512 #endif /* ndef HAVE_RFC2553 */
515 /*********************************************************************
517 * Function : write_socket
519 * Description : Write the contents of buf (for n bytes) to socket fd.
522 * 1 : fd = file descriptor (aka. handle) of socket to write to.
523 * 2 : buf = pointer to data to be written.
524 * 3 : len = length of data to be written to the socket "fd".
526 * Returns : 0 on success (entire buffer sent).
529 *********************************************************************/
531 int write_socket(jb_socket fd, const char *buf, ssize_t len)
533 int write_socket(jb_socket fd, const char *buf, size_t len)
541 if (len < 0) /* constant condition - size_t isn't ever negative */
546 log_error(LOG_LEVEL_WRITING, "to socket %d: %N", fd, len, buf);
549 return (send(fd, buf, (int)len, 0) != (int)len);
550 #elif defined(__BEOS__) || defined(AMIGA)
551 return (send(fd, buf, len, 0) != len);
552 #elif defined(__OS2__)
554 * Break the data up into SOCKET_SEND_MAX chunks for sending...
555 * OS/2 seemed to complain when the chunks were too large.
557 #define SOCKET_SEND_MAX 65000
559 int send_len, send_rc = 0, i = 0;
560 while ((i < len) && (send_rc != -1))
562 if ((i + SOCKET_SEND_MAX) > len)
565 send_len = SOCKET_SEND_MAX;
566 send_rc = send(fd,(char*)buf + i, send_len, 0);
574 return (write(fd, buf, len) != len);
580 /*********************************************************************
582 * Function : read_socket
584 * Description : Read from a TCP/IP socket in a platform independent way.
587 * 1 : fd = file descriptor of the socket to read
588 * 2 : buf = pointer to buffer where data will be written
589 * Must be >= len bytes long.
590 * 3 : len = maximum number of bytes to read
592 * Returns : On success, the number of bytes read is returned (zero
593 * indicates end of file), and the file position is advanced
594 * by this number. It is not an error if this number is
595 * smaller than the number of bytes requested; this may hap-
596 * pen for example because fewer bytes are actually available
597 * right now (maybe because we were close to end-of-file, or
598 * because we are reading from a pipe, or from a terminal,
599 * or because read() was interrupted by a signal). On error,
600 * -1 is returned, and errno is set appropriately. In this
601 * case it is left unspecified whether the file position (if
604 *********************************************************************/
605 int read_socket(jb_socket fd, char *buf, int len)
615 ret = recv(fd, buf, len, 0);
616 #elif defined(__BEOS__) || defined(AMIGA) || defined(__OS2__)
617 ret = recv(fd, buf, (size_t)len, 0);
619 ret = (int)read(fd, buf, (size_t)len);
624 log_error(LOG_LEVEL_RECEIVED, "from socket %d: %N", fd, ret, buf);
631 /*********************************************************************
633 * Function : data_is_available
635 * Description : Waits for data to arrive on a socket.
638 * 1 : fd = file descriptor of the socket to read
639 * 2 : seconds_to_wait = number of seconds after which we give up.
641 * Returns : TRUE if data arrived in time,
644 *********************************************************************/
645 int data_is_available(jb_socket fd, int seconds_to_wait)
649 struct timeval timeout;
652 memset(&timeout, 0, sizeof(timeout));
653 timeout.tv_sec = seconds_to_wait;
656 /* Copy and pasted from jcc.c ... */
657 memset(&rfds, 0, sizeof(fd_set));
663 n = select(fd+1, &rfds, NULL, NULL, &timeout);
666 * XXX: Do we care about the different error conditions?
668 return ((n == 1) && (1 == recv(fd, buf, 1, MSG_PEEK)));
672 /*********************************************************************
674 * Function : close_socket
676 * Description : Closes a TCP/IP socket
679 * 1 : fd = file descriptor of socket to be closed
683 *********************************************************************/
684 void close_socket(jb_socket fd)
686 #if defined(_WIN32) || defined(__BEOS__)
690 #elif defined(__OS2__)
699 /*********************************************************************
701 * Function : bind_port
703 * Description : Call socket, set socket options, and listen.
704 * Called by listen_loop to "boot up" our proxy address.
707 * 1 : hostnam = TCP/IP address to bind/listen to
708 * 2 : portnum = port to listen on
709 * 3 : pfd = pointer used to return file descriptor.
711 * Returns : if success, returns 0 and sets *pfd.
712 * if failure, returns -3 if address is in use,
713 * -2 if address unresolvable,
715 *********************************************************************/
716 int bind_port(const char *hostnam, int portnum, jb_socket *pfd)
719 struct addrinfo hints;
720 struct addrinfo *result, *rp;
722 * XXX: portnum should be a string to allow symbolic service
723 * names in the configuration file and to avoid the following
729 struct sockaddr_in inaddr;
730 #endif /* def HAVE_RFC2553 */
734 #endif /* ndef _WIN32 */
736 *pfd = JB_INVALID_SOCKET;
739 retval = snprintf(servnam, sizeof(servnam), "%d", portnum);
740 if ((-1 == retval) || (sizeof(servnam) <= retval))
742 log_error(LOG_LEVEL_ERROR,
743 "Port number (%d) ASCII decimal representation doesn't fit into 6 bytes",
748 memset(&hints, 0, sizeof(struct addrinfo));
752 * XXX: This is a hack. The right thing to do
753 * would be to bind to both AF_INET and AF_INET6.
754 * This will also fail if there is no AF_INET
757 hints.ai_family = AF_INET;
761 hints.ai_family = AF_UNSPEC;
763 hints.ai_socktype = SOCK_STREAM;
764 hints.ai_flags = AI_PASSIVE;
766 hints.ai_flags |= AI_ADDRCONFIG;
768 hints.ai_protocol = 0; /* Realy any stream protocol or TCP only */
769 hints.ai_canonname = NULL;
770 hints.ai_addr = NULL;
771 hints.ai_next = NULL;
773 if ((retval = getaddrinfo(hostnam, servnam, &hints, &result)))
775 log_error(LOG_LEVEL_ERROR,
776 "Can not resolve %s: %s", hostnam, gai_strerror(retval));
780 memset((char *)&inaddr, '\0', sizeof inaddr);
782 inaddr.sin_family = AF_INET;
783 inaddr.sin_addr.s_addr = resolve_hostname_to_ip(hostnam);
785 if (inaddr.sin_addr.s_addr == INADDR_NONE)
791 if (sizeof(inaddr.sin_port) == sizeof(short))
792 #endif /* ndef _WIN32 */
794 inaddr.sin_port = htons((unsigned short) portnum);
799 inaddr.sin_port = htonl((unsigned long) portnum);
801 #endif /* ndef _WIN32 */
802 #endif /* def HAVE_RFC2553 */
805 for (rp = result; rp != NULL; rp = rp->ai_next)
807 fd = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol);
809 fd = socket(AF_INET, SOCK_STREAM, 0);
810 #endif /* def HAVE_RFC2553 */
813 if (fd == JB_INVALID_SOCKET)
827 * This is not needed for Win32 - in fact, it stops
828 * duplicate instances of Privoxy from being caught.
830 * On UNIX, we assume the user is sensible enough not
831 * to start Privoxy multiple times on the same IP.
832 * Without this, stopping and restarting Privoxy
833 * from a script fails.
834 * Note: SO_REUSEADDR is meant to only take over
835 * sockets which are *not* in listen state in Linux,
836 * e.g. sockets in TIME_WAIT. YMMV.
838 setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char *)&one, sizeof(one));
839 #endif /* ndef _WIN32 */
842 if (bind(fd, rp->ai_addr, rp->ai_addrlen) < 0)
844 if (bind(fd, (struct sockaddr *)&inaddr, sizeof(inaddr)) < 0)
848 errno = WSAGetLastError();
849 if (errno == WSAEADDRINUSE)
851 if (errno == EADDRINUSE)
855 freeaddrinfo(result);
872 /* bind() succeeded, escape from for-loop */
874 * XXX: Support multiple listening sockets (e.g. localhost
875 * resolves to AF_INET and AF_INET6, but only the first address
882 freeaddrinfo(result);
885 /* All bind()s failed */
888 #endif /* ndef HAVE_RFC2553 */
890 while (listen(fd, MAX_LISTEN_BACKLOG) == -1)
904 /*********************************************************************
906 * Function : get_host_information
908 * Description : Determines the IP address the client used to
909 * reach us and the hostname associated with it.
911 * XXX: Most of the code has been copy and pasted
912 * from accept_connection() and not all of the
913 * ifdefs paths have been tested afterwards.
916 * 1 : afd = File descriptor returned from accept().
917 * 2 : ip_address = Pointer to return the pointer to
918 * the ip address string.
919 * 3 : hostname = Pointer to return the pointer to
920 * the hostname or NULL if the caller
921 * isn't interested in it.
925 *********************************************************************/
926 void get_host_information(jb_socket afd, char **ip_address, char **hostname)
929 struct sockaddr_storage server;
932 struct sockaddr_in server;
933 struct hostent *host = NULL;
934 #endif /* HAVE_RFC2553 */
935 #if defined(_WIN32) || defined(__OS2__) || defined(__APPLE_CC__) || defined(AMIGA)
936 /* according to accept_connection() this fixes a warning. */
937 int s_length, s_length_provided;
939 socklen_t s_length, s_length_provided;
942 #if defined(HAVE_GETHOSTBYADDR_R_8_ARGS) || defined(HAVE_GETHOSTBYADDR_R_7_ARGS) || defined(HAVE_GETHOSTBYADDR_R_5_ARGS)
943 struct hostent result;
944 #if defined(HAVE_GETHOSTBYADDR_R_5_ARGS)
945 struct hostent_data hdata;
947 char hbuf[HOSTENT_BUFFER_SIZE];
949 #endif /* def HAVE_GETHOSTBYADDR_R_5_ARGS */
950 #endif /* def HAVE_GETHOSTBYADDR_R_(8|7|5)_ARGS */
951 #endif /* ifndef HAVE_RFC2553 */
952 s_length = s_length_provided = sizeof(server);
954 if (NULL != hostname)
960 if (!getsockname(afd, (struct sockaddr *) &server, &s_length))
962 if (s_length > s_length_provided)
964 log_error(LOG_LEVEL_ERROR, "getsockname() truncated server address");
968 *ip_address = malloc(NI_MAXHOST);
969 if (NULL == *ip_address)
971 log_error(LOG_LEVEL_ERROR,
972 "Out of memory while getting the client's IP address.");
975 retval = getnameinfo((struct sockaddr *) &server, s_length,
976 *ip_address, NI_MAXHOST, NULL, 0, NI_NUMERICHOST);
979 log_error(LOG_LEVEL_ERROR,
980 "Unable to print my own IP address: %s", gai_strerror(retval));
985 *ip_address = strdup(inet_ntoa(server.sin_addr));
986 #endif /* HAVE_RFC2553 */
987 if (NULL == hostname)
990 * We're done here, the caller isn't
991 * interested in knowing the hostname.
997 *hostname = malloc(NI_MAXHOST);
998 if (NULL == *hostname)
1000 log_error(LOG_LEVEL_ERROR,
1001 "Out of memory while getting the client's hostname.");
1004 retval = getnameinfo((struct sockaddr *) &server, s_length,
1005 *hostname, NI_MAXHOST, NULL, 0, NI_NAMEREQD);
1008 log_error(LOG_LEVEL_ERROR,
1009 "Unable to resolve my own IP address: %s", gai_strerror(retval));
1013 #if defined(HAVE_GETHOSTBYADDR_R_8_ARGS)
1014 gethostbyaddr_r((const char *)&server.sin_addr,
1015 sizeof(server.sin_addr), AF_INET,
1016 &result, hbuf, HOSTENT_BUFFER_SIZE,
1018 #elif defined(HAVE_GETHOSTBYADDR_R_7_ARGS)
1019 host = gethostbyaddr_r((const char *)&server.sin_addr,
1020 sizeof(server.sin_addr), AF_INET,
1021 &result, hbuf, HOSTENT_BUFFER_SIZE, &thd_err);
1022 #elif defined(HAVE_GETHOSTBYADDR_R_5_ARGS)
1023 if (0 == gethostbyaddr_r((const char *)&server.sin_addr,
1024 sizeof(server.sin_addr), AF_INET,
1033 #elif defined(MUTEX_LOCKS_AVAILABLE)
1034 privoxy_mutex_lock(&resolver_mutex);
1035 host = gethostbyaddr((const char *)&server.sin_addr,
1036 sizeof(server.sin_addr), AF_INET);
1037 privoxy_mutex_unlock(&resolver_mutex);
1039 host = gethostbyaddr((const char *)&server.sin_addr,
1040 sizeof(server.sin_addr), AF_INET);
1044 log_error(LOG_LEVEL_ERROR, "Unable to get my own hostname: %E\n");
1048 *hostname = strdup(host->h_name);
1050 #endif /* else def HAVE_RFC2553 */
1057 /*********************************************************************
1059 * Function : accept_connection
1061 * Description : Accepts a connection on a socket. Socket must have
1062 * been created using bind_port().
1065 * 1 : csp = Client state, cfd, ip_addr_str, and
1066 * ip_addr_long will be set by this routine.
1067 * 2 : fd = file descriptor returned from bind_port
1069 * Returns : when a connection is accepted, it returns 1 (TRUE).
1070 * On an error it returns 0 (FALSE).
1072 *********************************************************************/
1073 int accept_connection(struct client_state * csp, jb_socket fd)
1076 /* XXX: client is stored directly into csp->tcp_addr */
1077 #define client (csp->tcp_addr)
1080 struct sockaddr_in client;
1083 #if defined(_WIN32) || defined(__OS2__) || defined(__APPLE_CC__) || defined(AMIGA)
1084 /* Wierdness - fix a warning. */
1090 c_length = sizeof(client);
1093 afd = accept (fd, (struct sockaddr *) &client, &c_length);
1094 if (afd == JB_INVALID_SOCKET)
1101 #if defined(FEATURE_ACCEPT_FILTER) && defined(SO_ACCEPTFILTER)
1102 struct accept_filter_arg af_options;
1103 bzero(&af_options, sizeof(af_options));
1104 strlcpy(af_options.af_name, "httpready", sizeof(af_options.af_name));
1105 setsockopt(fd, SOL_SOCKET, SO_ACCEPTFILTER, &af_options, sizeof(af_options));
1107 afd = accept (fd, (struct sockaddr *) &client, &c_length);
1108 } while (afd < 1 && errno == EINTR);
1117 csp->ip_addr_str = malloc(NI_MAXHOST);
1118 if (NULL == csp->ip_addr_str)
1120 log_error(LOG_LEVEL_ERROR,
1121 "Out of memory while getting the client's IP address.");
1124 retval = getnameinfo((struct sockaddr *) &client, c_length,
1125 csp->ip_addr_str, NI_MAXHOST, NULL, 0, NI_NUMERICHOST);
1126 if (!csp->ip_addr_str || retval)
1128 log_error(LOG_LEVEL_ERROR, "Can not save csp->ip_addr_str: %s",
1129 (csp->ip_addr_str) ? gai_strerror(retval) : "Insuffcient memory");
1130 freez(csp->ip_addr_str);
1134 csp->ip_addr_str = strdup(inet_ntoa(client.sin_addr));
1135 csp->ip_addr_long = ntohl(client.sin_addr.s_addr);
1136 #endif /* def HAVE_RFC2553 */
1143 /*********************************************************************
1145 * Function : resolve_hostname_to_ip
1147 * Description : Resolve a hostname to an internet tcp/ip address.
1148 * NULL or an empty string resolve to INADDR_ANY.
1151 * 1 : host = hostname to resolve
1153 * Returns : INADDR_NONE => failure, INADDR_ANY or tcp/ip address if succesful.
1155 *********************************************************************/
1156 unsigned long resolve_hostname_to_ip(const char *host)
1158 struct sockaddr_in inaddr;
1159 struct hostent *hostp;
1160 #if defined(HAVE_GETHOSTBYNAME_R_6_ARGS) || defined(HAVE_GETHOSTBYNAME_R_5_ARGS) || defined(HAVE_GETHOSTBYNAME_R_3_ARGS)
1161 struct hostent result;
1162 #if defined(HAVE_GETHOSTBYNAME_R_6_ARGS) || defined(HAVE_GETHOSTBYNAME_R_5_ARGS)
1163 char hbuf[HOSTENT_BUFFER_SIZE];
1165 #else /* defined(HAVE_GETHOSTBYNAME_R_3_ARGS) */
1166 struct hostent_data hdata;
1167 #endif /* def HAVE_GETHOSTBYNAME_R_(6|5)_ARGS */
1168 #endif /* def HAVE_GETHOSTBYNAME_R_(6|5|3)_ARGS */
1170 if ((host == NULL) || (*host == '\0'))
1175 memset((char *) &inaddr, 0, sizeof inaddr);
1177 if ((inaddr.sin_addr.s_addr = inet_addr(host)) == -1)
1179 unsigned int dns_retries = 0;
1180 #if defined(HAVE_GETHOSTBYNAME_R_6_ARGS)
1181 while (gethostbyname_r(host, &result, hbuf,
1182 HOSTENT_BUFFER_SIZE, &hostp, &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_5_ARGS)
1190 while (NULL == (hostp = gethostbyname_r(host, &result,
1191 hbuf, HOSTENT_BUFFER_SIZE, &thd_err))
1192 && (thd_err == TRY_AGAIN) && (dns_retries++ < MAX_DNS_RETRIES))
1194 log_error(LOG_LEVEL_ERROR,
1195 "Timeout #%u while trying to resolve %s. Trying again.",
1198 #elif defined(HAVE_GETHOSTBYNAME_R_3_ARGS)
1200 * XXX: Doesn't retry in case of soft errors.
1201 * Does this gethostbyname_r version set h_errno?
1203 if (0 == gethostbyname_r(host, &result, &hdata))
1211 #elif defined(MUTEX_LOCKS_AVAILABLE)
1212 privoxy_mutex_lock(&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 privoxy_mutex_unlock(&resolver_mutex);
1222 while (NULL == (hostp = gethostbyname(host))
1223 && (h_errno == TRY_AGAIN) && (dns_retries++ < MAX_DNS_RETRIES))
1225 log_error(LOG_LEVEL_ERROR,
1226 "Timeout #%u while trying to resolve %s. Trying again.",
1229 #endif /* def HAVE_GETHOSTBYNAME_R_(6|5|3)_ARGS */
1231 * On Mac OSX, if a domain exists but doesn't have a type A
1232 * record associated with it, the h_addr member of the struct
1233 * hostent returned by gethostbyname is NULL, even if h_length
1234 * is 4. Therefore the second test below.
1236 if (hostp == NULL || hostp->h_addr == NULL)
1239 log_error(LOG_LEVEL_ERROR, "could not resolve hostname %s", host);
1240 return(INADDR_NONE);
1242 if (hostp->h_addrtype != AF_INET)
1245 errno = WSAEPROTOTYPE;
1249 log_error(LOG_LEVEL_ERROR, "hostname %s resolves to unknown address type.", host);
1250 return(INADDR_NONE);
1253 (char *) &inaddr.sin_addr,
1254 (char *) hostp->h_addr,
1255 sizeof(inaddr.sin_addr)
1258 return(inaddr.sin_addr.s_addr);
1263 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
1264 /*********************************************************************
1266 * Function : socket_is_still_alive
1268 * Description : Figures out whether or not a socket is still alive.
1271 * 1 : sfd = The socket to check.
1273 * Returns : TRUE for yes, otherwise FALSE.
1275 *********************************************************************/
1276 int socket_is_still_alive(jb_socket sfd)
1279 int no_data_waiting;
1283 struct pollfd poll_fd[1];
1285 memset(poll_fd, 0, sizeof(poll_fd));
1286 poll_fd[0].fd = sfd;
1287 poll_fd[0].events = POLLIN;
1289 poll_result = poll(poll_fd, 1, 0);
1291 if (-1 == poll_result)
1293 log_error(LOG_LEVEL_CONNECT, "Polling socket %d failed.", sfd);
1296 no_data_waiting = !(poll_fd[0].revents & POLLIN);
1298 fd_set readable_fds;
1299 struct timeval timeout;
1302 memset(&timeout, '\0', sizeof(timeout));
1303 FD_ZERO(&readable_fds);
1304 FD_SET(sfd, &readable_fds);
1306 ret = select((int)sfd+1, &readable_fds, NULL, NULL, &timeout);
1309 log_error(LOG_LEVEL_CONNECT, "select() on socket %d failed: %E", sfd);
1312 no_data_waiting = !FD_ISSET(sfd, &readable_fds);
1313 #endif /* def HAVE_POLL */
1315 return (no_data_waiting || (1 == recv(sfd, buf, 1, MSG_PEEK)));
1317 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */