1 const char jbsockets_rcs[] = "$Id: jbsockets.c,v 1.122 2013/03/01 17:40:01 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 */
91 #endif /* def __GLIBC__ */
92 #endif /* HAVE_POLL */
96 /* For mutex semaphores only */
99 #include "jbsockets.h"
103 /* Mac OSX doesn't define AI_NUMERICSESRV */
104 #ifndef AI_NUMERICSERV
105 #define AI_NUMERICSERV 0
108 const char jbsockets_h_rcs[] = JBSOCKETS_H_VERSION;
111 * Maximum number of gethostbyname(_r) retries in case of
112 * soft errors (TRY_AGAIN).
113 * XXX: Does it make sense to make this a config option?
115 #define MAX_DNS_RETRIES 10
117 #define MAX_LISTEN_BACKLOG 128
120 static jb_socket rfc2553_connect_to(const char *host, int portnum, struct client_state *csp);
122 static jb_socket no_rfc2553_connect_to(const char *host, int portnum, struct client_state *csp);
125 /*********************************************************************
127 * Function : connect_to
129 * Description : Open a socket and connect to it. Will check
130 * that this is allowed according to ACL.
133 * 1 : host = hostname to connect to
134 * 2 : portnum = port to connect to (XXX: should be unsigned)
135 * 3 : csp = Current client state (buffers, headers, etc...)
137 * Returns : JB_INVALID_SOCKET => failure, else it is the socket
140 *********************************************************************/
141 jb_socket connect_to(const char *host, int portnum, struct client_state *csp)
144 int forwarded_connect_retries = 0;
149 * XXX: The whole errno overloading is ridiculous and should
150 * be replaced with something sane and thread safe
154 fd = rfc2553_connect_to(host, portnum, csp);
156 fd = no_rfc2553_connect_to(host, portnum, csp);
158 if ((fd != JB_INVALID_SOCKET) || (errno == EINVAL)
159 || (csp->fwd == NULL)
160 || ((csp->fwd->forward_host == NULL) && (csp->fwd->type == SOCKS_NONE)))
164 forwarded_connect_retries++;
165 if (csp->config->forwarded_connect_retries != 0)
167 log_error(LOG_LEVEL_ERROR,
168 "Attempt %d of %d to connect to %s failed. Trying again.",
169 forwarded_connect_retries, csp->config->forwarded_connect_retries + 1, host);
172 } while (forwarded_connect_retries < csp->config->forwarded_connect_retries);
178 /* Getaddrinfo implementation */
179 static jb_socket rfc2553_connect_to(const char *host, int portnum, struct client_state *csp)
181 struct addrinfo hints, *result, *rp;
186 struct timeval timeout;
187 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
192 * XXX: Initializeing it here is only necessary
193 * because not all situations are properly
196 int socket_error = 0;
199 struct access_control_addr dst[1];
200 #endif /* def FEATURE_ACL */
202 /* Don't leak memory when retrying. */
203 freez(csp->error_message);
204 freez(csp->http->host_ip_addr_str);
206 retval = snprintf(service, sizeof(service), "%d", portnum);
207 if ((-1 == retval) || (sizeof(service) <= retval))
209 log_error(LOG_LEVEL_ERROR,
210 "Port number (%d) ASCII decimal representation doesn't fit into 6 bytes",
212 csp->error_message = strdup("Invalid port number");
213 csp->http->host_ip_addr_str = strdup("unknown");
214 return(JB_INVALID_SOCKET);
217 memset((char *)&hints, 0, sizeof(hints));
218 hints.ai_family = AF_UNSPEC;
219 hints.ai_socktype = SOCK_STREAM;
220 hints.ai_flags = AI_NUMERICSERV; /* avoid service look-up */
222 hints.ai_flags |= AI_ADDRCONFIG;
224 if ((retval = getaddrinfo(host, service, &hints, &result)))
226 log_error(LOG_LEVEL_INFO,
227 "Can not resolve %s: %s", host, gai_strerror(retval));
228 /* XXX: Should find a better way to propagate this error. */
230 csp->error_message = strdup(gai_strerror(retval));
231 csp->http->host_ip_addr_str = strdup("unknown");
232 return(JB_INVALID_SOCKET);
235 csp->http->host_ip_addr_str = malloc(NI_MAXHOST);
236 if (NULL == csp->http->host_ip_addr_str)
238 freeaddrinfo(result);
239 log_error(LOG_LEVEL_ERROR,
240 "Out of memory while getting the server IP address.");
241 return JB_INVALID_SOCKET;
244 for (rp = result; rp != NULL; rp = rp->ai_next)
248 memcpy(&dst->addr, rp->ai_addr, rp->ai_addrlen);
250 if (block_acl(dst, csp))
253 socket_error = errno = SOCEPERM;
255 socket_error = errno = EPERM;
259 #endif /* def FEATURE_ACL */
261 retval = getnameinfo(rp->ai_addr, rp->ai_addrlen,
262 csp->http->host_ip_addr_str, NI_MAXHOST, NULL, 0, NI_NUMERICHOST);
265 log_error(LOG_LEVEL_ERROR,
266 "Failed to get the host name from the socket structure: %s",
267 gai_strerror(retval));
271 fd = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol);
273 if (fd == JB_INVALID_SOCKET)
282 if (fd >= FD_SETSIZE)
284 log_error(LOG_LEVEL_ERROR,
285 "Server socket number too high to use select(): %d >= %d",
288 return JB_INVALID_SOCKET;
293 { /* turn off TCP coalescence */
295 setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, (char *) &mi, sizeof (int));
297 #endif /* def TCP_NODELAY */
299 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
300 if ((flags = fcntl(fd, F_GETFL, 0)) != -1)
303 fcntl(fd, F_SETFL, flags);
305 #endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__) */
308 while (connect(fd, rp->ai_addr, rp->ai_addrlen) == JB_INVALID_SOCKET)
311 errno = sock_errno();
315 if (errno == WSAEINPROGRESS)
316 #else /* ifndef _WIN32 */
317 if (errno == EINPROGRESS)
318 #endif /* ndef _WIN32 || __OS2__ */
325 socket_error = errno;
336 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
340 fcntl(fd, F_SETFL, flags);
342 #endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__) */
344 /* wait for connection to complete */
348 memset(&timeout, 0, sizeof(timeout));
351 /* MS Windows uses int, not SOCKET, for the 1st arg of select(). Weird! */
352 if ((select((int)fd + 1, NULL, &wfds, NULL, &timeout) > 0)
353 && FD_ISSET(fd, &wfds))
355 socklen_t optlen = sizeof(socket_error);
356 if (!getsockopt(fd, SOL_SOCKET, SO_ERROR, &socket_error, &optlen))
360 /* Connection established, no need to try other addresses. */
363 if (rp->ai_next != NULL)
366 * There's another address we can try, so log that this
367 * one didn't work out. If the last one fails, too,
368 * it will get logged outside the loop body so we don't
369 * have to mention it here.
371 log_error(LOG_LEVEL_CONNECT, "Could not connect to [%s]:%s: %s.",
372 csp->http->host_ip_addr_str, service, strerror(socket_error));
377 socket_error = errno;
378 log_error(LOG_LEVEL_ERROR, "Could not get the state of "
379 "the connection to [%s]:%s: %s; dropping connection.",
380 csp->http->host_ip_addr_str, service, strerror(errno));
384 /* Connection failed, try next address */
388 freeaddrinfo(result);
391 log_error(LOG_LEVEL_CONNECT, "Could not connect to [%s]:%s: %s.",
392 host, service, strerror(socket_error));
393 csp->error_message = strdup(strerror(socket_error));
394 return(JB_INVALID_SOCKET);
396 log_error(LOG_LEVEL_CONNECT, "Connected to %s[%s]:%s.",
397 host, csp->http->host_ip_addr_str, service);
403 #else /* ndef HAVE_RFC2553 */
404 /* Pre-getaddrinfo implementation */
406 static jb_socket no_rfc2553_connect_to(const char *host, int portnum, struct client_state *csp)
408 struct sockaddr_in inaddr;
412 struct timeval tv[1];
413 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
418 struct access_control_addr dst[1];
419 #endif /* def FEATURE_ACL */
421 /* Don't leak memory when retrying. */
422 freez(csp->http->host_ip_addr_str);
424 memset((char *)&inaddr, 0, sizeof inaddr);
426 if ((addr = resolve_hostname_to_ip(host)) == INADDR_NONE)
428 csp->http->host_ip_addr_str = strdup("unknown");
429 return(JB_INVALID_SOCKET);
433 dst->addr = ntohl(addr);
436 if (block_acl(dst, csp))
443 return(JB_INVALID_SOCKET);
445 #endif /* def FEATURE_ACL */
447 inaddr.sin_addr.s_addr = addr;
448 inaddr.sin_family = AF_INET;
449 csp->http->host_ip_addr_str = strdup(inet_ntoa(inaddr.sin_addr));
452 if (sizeof(inaddr.sin_port) == sizeof(short))
453 #endif /* ndef _WIN32 */
455 inaddr.sin_port = htons((unsigned short) portnum);
460 inaddr.sin_port = htonl((unsigned long)portnum);
462 #endif /* ndef _WIN32 */
464 fd = socket(inaddr.sin_family, SOCK_STREAM, 0);
466 if (fd == JB_INVALID_SOCKET)
471 return(JB_INVALID_SOCKET);
475 if (fd >= FD_SETSIZE)
477 log_error(LOG_LEVEL_ERROR,
478 "Server socket number too high to use select(): %d >= %d",
481 return JB_INVALID_SOCKET;
486 { /* turn off TCP coalescence */
488 setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, (char *) &mi, sizeof (int));
490 #endif /* def TCP_NODELAY */
492 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
493 if ((flags = fcntl(fd, F_GETFL, 0)) != -1)
496 fcntl(fd, F_SETFL, flags);
498 #endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__) */
500 while (connect(fd, (struct sockaddr *) & inaddr, sizeof inaddr) == JB_INVALID_SOCKET)
503 if (errno == WSAEINPROGRESS)
505 if (sock_errno() == EINPROGRESS)
506 #else /* ifndef _WIN32 */
507 if (errno == EINPROGRESS)
508 #endif /* ndef _WIN32 || __OS2__ */
514 if (sock_errno() != EINTR)
520 return(JB_INVALID_SOCKET);
524 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
528 fcntl(fd, F_SETFL, flags);
530 #endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__) */
532 /* wait for connection to complete */
539 /* MS Windows uses int, not SOCKET, for the 1st arg of select(). Weird! */
540 if (select((int)fd + 1, NULL, &wfds, NULL, tv) <= 0)
543 return(JB_INVALID_SOCKET);
548 #endif /* ndef HAVE_RFC2553 */
551 /*********************************************************************
553 * Function : write_socket
555 * Description : Write the contents of buf (for n bytes) to socket fd.
558 * 1 : fd = file descriptor (aka. handle) of socket to write to.
559 * 2 : buf = pointer to data to be written.
560 * 3 : len = length of data to be written to the socket "fd".
562 * Returns : 0 on success (entire buffer sent).
565 *********************************************************************/
567 int write_socket(jb_socket fd, const char *buf, ssize_t len)
569 int write_socket(jb_socket fd, const char *buf, size_t len)
577 log_error(LOG_LEVEL_WRITING, "to socket %d: %N", fd, len, buf);
580 return (send(fd, buf, (int)len, 0) != (int)len);
581 #elif defined(__BEOS__) || defined(AMIGA)
582 return (send(fd, buf, len, 0) != len);
583 #elif defined(__OS2__)
585 * Break the data up into SOCKET_SEND_MAX chunks for sending...
586 * OS/2 seemed to complain when the chunks were too large.
588 #define SOCKET_SEND_MAX 65000
590 int send_len, send_rc = 0, i = 0;
591 while ((i < len) && (send_rc != -1))
593 if ((i + SOCKET_SEND_MAX) > len)
596 send_len = SOCKET_SEND_MAX;
597 send_rc = send(fd,(char*)buf + i, send_len, 0);
605 return (write(fd, buf, len) != len);
611 /*********************************************************************
613 * Function : read_socket
615 * Description : Read from a TCP/IP socket in a platform independent way.
618 * 1 : fd = file descriptor of the socket to read
619 * 2 : buf = pointer to buffer where data will be written
620 * Must be >= len bytes long.
621 * 3 : len = maximum number of bytes to read
623 * Returns : On success, the number of bytes read is returned (zero
624 * indicates end of file), and the file position is advanced
625 * by this number. It is not an error if this number is
626 * smaller than the number of bytes requested; this may hap-
627 * pen for example because fewer bytes are actually available
628 * right now (maybe because we were close to end-of-file, or
629 * because we are reading from a pipe, or from a terminal,
630 * or because read() was interrupted by a signal). On error,
631 * -1 is returned, and errno is set appropriately. In this
632 * case it is left unspecified whether the file position (if
635 *********************************************************************/
636 int read_socket(jb_socket fd, char *buf, int len)
646 ret = recv(fd, buf, len, 0);
647 #elif defined(__BEOS__) || defined(AMIGA) || defined(__OS2__)
648 ret = recv(fd, buf, (size_t)len, 0);
650 ret = (int)read(fd, buf, (size_t)len);
655 log_error(LOG_LEVEL_RECEIVED, "from socket %d: %N", fd, ret, buf);
662 /*********************************************************************
664 * Function : data_is_available
666 * Description : Waits for data to arrive on a socket.
669 * 1 : fd = file descriptor of the socket to read
670 * 2 : seconds_to_wait = number of seconds after which we give up.
672 * Returns : TRUE if data arrived in time,
675 *********************************************************************/
676 int data_is_available(jb_socket fd, int seconds_to_wait)
680 struct timeval timeout;
683 memset(&timeout, 0, sizeof(timeout));
684 timeout.tv_sec = seconds_to_wait;
687 /* Copy and pasted from jcc.c ... */
688 memset(&rfds, 0, sizeof(fd_set));
694 n = select(fd+1, &rfds, NULL, NULL, &timeout);
697 * XXX: Do we care about the different error conditions?
699 return ((n == 1) && (1 == recv(fd, buf, 1, MSG_PEEK)));
703 /*********************************************************************
705 * Function : close_socket
707 * Description : Closes a TCP/IP socket
710 * 1 : fd = file descriptor of socket to be closed
714 *********************************************************************/
715 void close_socket(jb_socket fd)
717 #if defined(_WIN32) || defined(__BEOS__)
721 #elif defined(__OS2__)
729 /*********************************************************************
731 * Function : drain_and_close_socket
733 * Description : Closes a TCP/IP socket after draining unread data
736 * 1 : fd = file descriptor of the socket to be closed
740 *********************************************************************/
741 void drain_and_close_socket(jb_socket fd)
743 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
744 if (socket_is_still_alive(fd))
747 int bytes_drained_total = 0;
751 /* Apparently Windows has shutdown() but not SHUT_WR. */
755 if (0 != shutdown(fd, SHUT_WR))
757 log_error(LOG_LEVEL_CONNECT, "Failed to shutdown socket %d: %E", fd);
760 #define ARBITRARY_DRAIN_LIMIT 10000
765 if (!data_is_available(fd, 0))
768 * If there is no data available right now, don't try
769 * to drain the socket as read_socket() could block.
774 bytes_drained = read_socket(fd, drainage, sizeof(drainage));
775 if (bytes_drained < 0)
777 log_error(LOG_LEVEL_CONNECT, "Failed to drain socket %d: %E", fd);
779 else if (bytes_drained > 0)
781 bytes_drained_total += bytes_drained;
782 if (bytes_drained_total > ARBITRARY_DRAIN_LIMIT)
784 log_error(LOG_LEVEL_CONNECT, "Giving up draining socket %d", fd);
788 } while (bytes_drained > 0);
789 if (bytes_drained_total != 0)
791 log_error(LOG_LEVEL_CONNECT,
792 "Drained %d bytes before closing socket %d", bytes_drained_total, fd);
801 /*********************************************************************
803 * Function : bind_port
805 * Description : Call socket, set socket options, and listen.
806 * Called by listen_loop to "boot up" our proxy address.
809 * 1 : hostnam = TCP/IP address to bind/listen to
810 * 2 : portnum = port to listen on
811 * 3 : pfd = pointer used to return file descriptor.
813 * Returns : if success, returns 0 and sets *pfd.
814 * if failure, returns -3 if address is in use,
815 * -2 if address unresolvable,
817 *********************************************************************/
818 int bind_port(const char *hostnam, int portnum, jb_socket *pfd)
821 struct addrinfo hints;
822 struct addrinfo *result, *rp;
824 * XXX: portnum should be a string to allow symbolic service
825 * names in the configuration file and to avoid the following
831 struct sockaddr_in inaddr;
832 #endif /* def HAVE_RFC2553 */
836 #endif /* ndef _WIN32 */
838 *pfd = JB_INVALID_SOCKET;
841 retval = snprintf(servnam, sizeof(servnam), "%d", portnum);
842 if ((-1 == retval) || (sizeof(servnam) <= retval))
844 log_error(LOG_LEVEL_ERROR,
845 "Port number (%d) ASCII decimal representation doesn't fit into 6 bytes",
850 memset(&hints, 0, sizeof(struct addrinfo));
854 * XXX: This is a hack. The right thing to do
855 * would be to bind to both AF_INET and AF_INET6.
856 * This will also fail if there is no AF_INET
859 hints.ai_family = AF_INET;
863 hints.ai_family = AF_UNSPEC;
865 hints.ai_socktype = SOCK_STREAM;
866 hints.ai_flags = AI_PASSIVE;
867 hints.ai_protocol = 0; /* Really any stream protocol or TCP only */
868 hints.ai_canonname = NULL;
869 hints.ai_addr = NULL;
870 hints.ai_next = NULL;
872 if ((retval = getaddrinfo(hostnam, servnam, &hints, &result)))
874 log_error(LOG_LEVEL_ERROR,
875 "Can not resolve %s: %s", hostnam, gai_strerror(retval));
879 memset((char *)&inaddr, '\0', sizeof inaddr);
881 inaddr.sin_family = AF_INET;
882 inaddr.sin_addr.s_addr = resolve_hostname_to_ip(hostnam);
884 if (inaddr.sin_addr.s_addr == INADDR_NONE)
890 if (sizeof(inaddr.sin_port) == sizeof(short))
891 #endif /* ndef _WIN32 */
893 inaddr.sin_port = htons((unsigned short) portnum);
898 inaddr.sin_port = htonl((unsigned long) portnum);
900 #endif /* ndef _WIN32 */
901 #endif /* def HAVE_RFC2553 */
904 for (rp = result; rp != NULL; rp = rp->ai_next)
906 fd = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol);
908 fd = socket(AF_INET, SOCK_STREAM, 0);
909 #endif /* def HAVE_RFC2553 */
912 if (fd == JB_INVALID_SOCKET)
926 * This is not needed for Win32 - in fact, it stops
927 * duplicate instances of Privoxy from being caught.
929 * On UNIX, we assume the user is sensible enough not
930 * to start Privoxy multiple times on the same IP.
931 * Without this, stopping and restarting Privoxy
932 * from a script fails.
933 * Note: SO_REUSEADDR is meant to only take over
934 * sockets which are *not* in listen state in Linux,
935 * e.g. sockets in TIME_WAIT. YMMV.
937 setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char *)&one, sizeof(one));
938 #endif /* ndef _WIN32 */
941 if (bind(fd, rp->ai_addr, rp->ai_addrlen) < 0)
943 if (bind(fd, (struct sockaddr *)&inaddr, sizeof(inaddr)) < 0)
947 errno = WSAGetLastError();
948 if (errno == WSAEADDRINUSE)
950 if (errno == EADDRINUSE)
954 freeaddrinfo(result);
971 /* bind() succeeded, escape from for-loop */
973 * XXX: Support multiple listening sockets (e.g. localhost
974 * resolves to AF_INET and AF_INET6, but only the first address
981 freeaddrinfo(result);
984 /* All bind()s failed */
987 #endif /* ndef HAVE_RFC2553 */
989 while (listen(fd, MAX_LISTEN_BACKLOG) == -1)
1003 /*********************************************************************
1005 * Function : get_host_information
1007 * Description : Determines the IP address the client used to
1008 * reach us and the hostname associated with it.
1010 * XXX: Most of the code has been copy and pasted
1011 * from accept_connection() and not all of the
1012 * ifdefs paths have been tested afterwards.
1015 * 1 : afd = File descriptor returned from accept().
1016 * 2 : ip_address = Pointer to return the pointer to
1017 * the ip address string.
1018 * 3 : port = Pointer to return the pointer to
1019 * the TCP port string.
1020 * 4 : hostname = Pointer to return the pointer to
1021 * the hostname or NULL if the caller
1022 * isn't interested in it.
1026 *********************************************************************/
1027 void get_host_information(jb_socket afd, char **ip_address, char **port,
1031 struct sockaddr_storage server;
1034 struct sockaddr_in server;
1035 struct hostent *host = NULL;
1036 #endif /* HAVE_RFC2553 */
1037 #if defined(_WIN32) || defined(__OS2__) || defined(AMIGA)
1038 /* according to accept_connection() this fixes a warning. */
1039 int s_length, s_length_provided;
1041 socklen_t s_length, s_length_provided;
1043 #ifndef HAVE_RFC2553
1044 #if defined(HAVE_GETHOSTBYADDR_R_8_ARGS) || defined(HAVE_GETHOSTBYADDR_R_7_ARGS) || defined(HAVE_GETHOSTBYADDR_R_5_ARGS)
1045 struct hostent result;
1046 #if defined(HAVE_GETHOSTBYADDR_R_5_ARGS)
1047 struct hostent_data hdata;
1049 char hbuf[HOSTENT_BUFFER_SIZE];
1051 #endif /* def HAVE_GETHOSTBYADDR_R_5_ARGS */
1052 #endif /* def HAVE_GETHOSTBYADDR_R_(8|7|5)_ARGS */
1053 #endif /* ifndef HAVE_RFC2553 */
1054 s_length = s_length_provided = sizeof(server);
1056 if (NULL != hostname)
1063 if (!getsockname(afd, (struct sockaddr *) &server, &s_length))
1065 if (s_length > s_length_provided)
1067 log_error(LOG_LEVEL_ERROR, "getsockname() truncated server address");
1071 * XXX: Workaround for missing header on Windows when
1072 * configured with --disable-ipv6-support.
1073 * The proper fix is to not use NI_MAXSERV in
1074 * that case. It works by accident on other platforms
1075 * as <netdb.h> in included unconditionally there.
1078 #define NI_MAXSERV 32
1080 *port = malloc(NI_MAXSERV);
1083 log_error(LOG_LEVEL_ERROR,
1084 "Out of memory while getting the client's port.");
1088 *ip_address = malloc(NI_MAXHOST);
1089 if (NULL == *ip_address)
1091 log_error(LOG_LEVEL_ERROR,
1092 "Out of memory while getting the client's IP address.");
1096 retval = getnameinfo((struct sockaddr *) &server, s_length,
1097 *ip_address, NI_MAXHOST, *port, NI_MAXSERV,
1098 NI_NUMERICHOST|NI_NUMERICSERV);
1101 log_error(LOG_LEVEL_ERROR,
1102 "Unable to print my own IP address: %s", gai_strerror(retval));
1108 *ip_address = strdup(inet_ntoa(server.sin_addr));
1109 snprintf(*port, NI_MAXSERV, "%hu", ntohs(server.sin_port));
1110 #endif /* HAVE_RFC2553 */
1111 if (NULL == hostname)
1114 * We're done here, the caller isn't
1115 * interested in knowing the hostname.
1121 *hostname = malloc(NI_MAXHOST);
1122 if (NULL == *hostname)
1124 log_error(LOG_LEVEL_ERROR,
1125 "Out of memory while getting the client's hostname.");
1128 retval = getnameinfo((struct sockaddr *) &server, s_length,
1129 *hostname, NI_MAXHOST, NULL, 0, NI_NAMEREQD);
1132 log_error(LOG_LEVEL_ERROR,
1133 "Unable to resolve my own IP address: %s", gai_strerror(retval));
1137 #if defined(HAVE_GETHOSTBYADDR_R_8_ARGS)
1138 gethostbyaddr_r((const char *)&server.sin_addr,
1139 sizeof(server.sin_addr), AF_INET,
1140 &result, hbuf, HOSTENT_BUFFER_SIZE,
1142 #elif defined(HAVE_GETHOSTBYADDR_R_7_ARGS)
1143 host = gethostbyaddr_r((const char *)&server.sin_addr,
1144 sizeof(server.sin_addr), AF_INET,
1145 &result, hbuf, HOSTENT_BUFFER_SIZE, &thd_err);
1146 #elif defined(HAVE_GETHOSTBYADDR_R_5_ARGS)
1147 if (0 == gethostbyaddr_r((const char *)&server.sin_addr,
1148 sizeof(server.sin_addr), AF_INET,
1157 #elif defined(MUTEX_LOCKS_AVAILABLE)
1158 privoxy_mutex_lock(&resolver_mutex);
1159 host = gethostbyaddr((const char *)&server.sin_addr,
1160 sizeof(server.sin_addr), AF_INET);
1161 privoxy_mutex_unlock(&resolver_mutex);
1163 host = gethostbyaddr((const char *)&server.sin_addr,
1164 sizeof(server.sin_addr), AF_INET);
1168 log_error(LOG_LEVEL_ERROR, "Unable to get my own hostname: %E\n");
1172 *hostname = strdup(host->h_name);
1174 #endif /* else def HAVE_RFC2553 */
1181 /*********************************************************************
1183 * Function : accept_connection
1185 * Description : Accepts a connection on one of possibly multiple
1186 * sockets. The socket(s) to check must have been
1187 * created using bind_port().
1190 * 1 : csp = Client state, cfd, ip_addr_str, and
1191 * ip_addr_long will be set by this routine.
1192 * 2 : fds = File descriptors returned from bind_port
1194 * Returns : when a connection is accepted, it returns 1 (TRUE).
1195 * On an error it returns 0 (FALSE).
1197 *********************************************************************/
1198 int accept_connection(struct client_state * csp, jb_socket fds[])
1201 /* XXX: client is stored directly into csp->tcp_addr */
1202 #define client (csp->tcp_addr)
1204 struct sockaddr_in client;
1207 #if defined(_WIN32) || defined(__OS2__) || defined(AMIGA)
1208 /* Wierdness - fix a warning. */
1215 int max_selected_socket;
1216 fd_set selected_fds;
1219 c_length = sizeof(client);
1222 * Wait for a connection on any socket.
1223 * Return immediately if no socket is listening.
1224 * XXX: Why not treat this as fatal error?
1226 FD_ZERO(&selected_fds);
1227 max_selected_socket = 0;
1228 for (i = 0; i < MAX_LISTENING_SOCKETS; i++)
1230 if (JB_INVALID_SOCKET != fds[i])
1232 FD_SET(fds[i], &selected_fds);
1233 if (max_selected_socket < fds[i] + 1)
1235 max_selected_socket = fds[i] + 1;
1239 if (0 == max_selected_socket)
1245 retval = select(max_selected_socket, &selected_fds, NULL, NULL, NULL);
1246 } while (retval < 0 && errno == EINTR);
1251 log_error(LOG_LEVEL_ERROR,
1252 "Waiting on new client failed because select(2) returned 0."
1253 " This should not happen.");
1257 log_error(LOG_LEVEL_ERROR,
1258 "Waiting on new client failed because of problems in select(2): "
1259 "%s.", strerror(errno));
1263 for (i = 0; i < MAX_LISTENING_SOCKETS && !FD_ISSET(fds[i], &selected_fds);
1265 if (i >= MAX_LISTENING_SOCKETS)
1267 log_error(LOG_LEVEL_ERROR,
1268 "select(2) reported connected clients (number = %u, "
1269 "descriptor boundary = %u), but none found.",
1270 retval, max_selected_socket);
1275 /* Accept selected connection */
1277 afd = accept (fd, (struct sockaddr *) &client, &c_length);
1278 if (afd == JB_INVALID_SOCKET)
1285 #if defined(FEATURE_ACCEPT_FILTER) && defined(SO_ACCEPTFILTER)
1286 struct accept_filter_arg af_options;
1287 bzero(&af_options, sizeof(af_options));
1288 strlcpy(af_options.af_name, "httpready", sizeof(af_options.af_name));
1289 setsockopt(fd, SOL_SOCKET, SO_ACCEPTFILTER, &af_options, sizeof(af_options));
1291 afd = accept (fd, (struct sockaddr *) &client, &c_length);
1292 } while (afd < 1 && errno == EINTR);
1301 struct linger linger_options;
1302 linger_options.l_onoff = 1;
1303 linger_options.l_linger = 5;
1304 if (0 != setsockopt(fd, SOL_SOCKET, SO_LINGER, &linger_options, sizeof(linger_options)))
1306 log_error(LOG_LEVEL_ERROR, "Setting SO_LINGER on socket %d failed.", afd);
1312 if (afd >= FD_SETSIZE)
1314 log_error(LOG_LEVEL_ERROR,
1315 "Client socket number too high to use select(): %d >= %d",
1324 csp->ip_addr_str = malloc(NI_MAXHOST);
1325 if (NULL == csp->ip_addr_str)
1327 log_error(LOG_LEVEL_ERROR,
1328 "Out of memory while getting the client's IP address.");
1331 retval = getnameinfo((struct sockaddr *) &client, c_length,
1332 csp->ip_addr_str, NI_MAXHOST, NULL, 0, NI_NUMERICHOST);
1333 if (!csp->ip_addr_str || retval)
1335 log_error(LOG_LEVEL_ERROR, "Can not save csp->ip_addr_str: %s",
1336 (csp->ip_addr_str) ? gai_strerror(retval) : "Insuffcient memory");
1337 freez(csp->ip_addr_str);
1341 csp->ip_addr_str = strdup(inet_ntoa(client.sin_addr));
1342 csp->ip_addr_long = ntohl(client.sin_addr.s_addr);
1343 #endif /* def HAVE_RFC2553 */
1350 /*********************************************************************
1352 * Function : resolve_hostname_to_ip
1354 * Description : Resolve a hostname to an internet tcp/ip address.
1355 * NULL or an empty string resolve to INADDR_ANY.
1358 * 1 : host = hostname to resolve
1360 * Returns : INADDR_NONE => failure, INADDR_ANY or tcp/ip address if successful.
1362 *********************************************************************/
1363 unsigned long resolve_hostname_to_ip(const char *host)
1365 struct sockaddr_in inaddr;
1366 struct hostent *hostp;
1367 #if defined(HAVE_GETHOSTBYNAME_R_6_ARGS) || defined(HAVE_GETHOSTBYNAME_R_5_ARGS) || defined(HAVE_GETHOSTBYNAME_R_3_ARGS)
1368 struct hostent result;
1369 #if defined(HAVE_GETHOSTBYNAME_R_6_ARGS) || defined(HAVE_GETHOSTBYNAME_R_5_ARGS)
1370 char hbuf[HOSTENT_BUFFER_SIZE];
1372 #else /* defined(HAVE_GETHOSTBYNAME_R_3_ARGS) */
1373 struct hostent_data hdata;
1374 #endif /* def HAVE_GETHOSTBYNAME_R_(6|5)_ARGS */
1375 #endif /* def HAVE_GETHOSTBYNAME_R_(6|5|3)_ARGS */
1377 if ((host == NULL) || (*host == '\0'))
1382 memset((char *) &inaddr, 0, sizeof inaddr);
1384 if ((inaddr.sin_addr.s_addr = inet_addr(host)) == -1)
1386 unsigned int dns_retries = 0;
1387 #if defined(HAVE_GETHOSTBYNAME_R_6_ARGS)
1388 while (gethostbyname_r(host, &result, hbuf,
1389 HOSTENT_BUFFER_SIZE, &hostp, &thd_err)
1390 && (thd_err == TRY_AGAIN) && (dns_retries++ < MAX_DNS_RETRIES))
1392 log_error(LOG_LEVEL_ERROR,
1393 "Timeout #%u while trying to resolve %s. Trying again.",
1396 #elif defined(HAVE_GETHOSTBYNAME_R_5_ARGS)
1397 while (NULL == (hostp = gethostbyname_r(host, &result,
1398 hbuf, HOSTENT_BUFFER_SIZE, &thd_err))
1399 && (thd_err == TRY_AGAIN) && (dns_retries++ < MAX_DNS_RETRIES))
1401 log_error(LOG_LEVEL_ERROR,
1402 "Timeout #%u while trying to resolve %s. Trying again.",
1405 #elif defined(HAVE_GETHOSTBYNAME_R_3_ARGS)
1407 * XXX: Doesn't retry in case of soft errors.
1408 * Does this gethostbyname_r version set h_errno?
1410 if (0 == gethostbyname_r(host, &result, &hdata))
1418 #elif defined(MUTEX_LOCKS_AVAILABLE)
1419 privoxy_mutex_lock(&resolver_mutex);
1420 while (NULL == (hostp = gethostbyname(host))
1421 && (h_errno == TRY_AGAIN) && (dns_retries++ < MAX_DNS_RETRIES))
1423 log_error(LOG_LEVEL_ERROR,
1424 "Timeout #%u while trying to resolve %s. Trying again.",
1427 privoxy_mutex_unlock(&resolver_mutex);
1429 while (NULL == (hostp = gethostbyname(host))
1430 && (h_errno == TRY_AGAIN) && (dns_retries++ < MAX_DNS_RETRIES))
1432 log_error(LOG_LEVEL_ERROR,
1433 "Timeout #%u while trying to resolve %s. Trying again.",
1436 #endif /* def HAVE_GETHOSTBYNAME_R_(6|5|3)_ARGS */
1438 * On Mac OSX, if a domain exists but doesn't have a type A
1439 * record associated with it, the h_addr member of the struct
1440 * hostent returned by gethostbyname is NULL, even if h_length
1441 * is 4. Therefore the second test below.
1443 if (hostp == NULL || hostp->h_addr == NULL)
1446 log_error(LOG_LEVEL_ERROR, "could not resolve hostname %s", host);
1447 return(INADDR_NONE);
1449 if (hostp->h_addrtype != AF_INET)
1452 errno = WSAEPROTOTYPE;
1456 log_error(LOG_LEVEL_ERROR, "hostname %s resolves to unknown address type.", host);
1457 return(INADDR_NONE);
1459 memcpy((char *)&inaddr.sin_addr, (char *)hostp->h_addr, sizeof(inaddr.sin_addr));
1461 return(inaddr.sin_addr.s_addr);
1466 /*********************************************************************
1468 * Function : socket_is_still_alive
1470 * Description : Figures out whether or not a socket is still alive.
1473 * 1 : sfd = The socket to check.
1475 * Returns : TRUE for yes, otherwise FALSE.
1477 *********************************************************************/
1478 int socket_is_still_alive(jb_socket sfd)
1481 int no_data_waiting;
1485 struct pollfd poll_fd[1];
1487 memset(poll_fd, 0, sizeof(poll_fd));
1488 poll_fd[0].fd = sfd;
1489 poll_fd[0].events = POLLIN;
1491 poll_result = poll(poll_fd, 1, 0);
1493 if (-1 == poll_result)
1495 log_error(LOG_LEVEL_CONNECT, "Polling socket %d failed.", sfd);
1498 no_data_waiting = !(poll_fd[0].revents & POLLIN);
1500 fd_set readable_fds;
1501 struct timeval timeout;
1504 memset(&timeout, '\0', sizeof(timeout));
1505 FD_ZERO(&readable_fds);
1506 FD_SET(sfd, &readable_fds);
1508 ret = select((int)sfd+1, &readable_fds, NULL, NULL, &timeout);
1511 log_error(LOG_LEVEL_CONNECT, "select() on socket %d failed: %E", sfd);
1514 no_data_waiting = !FD_ISSET(sfd, &readable_fds);
1515 #endif /* def HAVE_POLL */
1517 return (no_data_waiting || (1 == recv(sfd, buf, 1, MSG_PEEK)));