1 const char jbsockets_rcs[] = "$Id: jbsockets.c,v 1.96 2011/03/27 14:03:43 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 freeaddrinfo(result);
236 log_error(LOG_LEVEL_ERROR,
237 "Out of memory while getting the server IP address.");
238 return JB_INVALID_SOCKET;
241 for (rp = result; rp != NULL; rp = rp->ai_next)
245 memcpy(&dst->addr, rp->ai_addr, rp->ai_addrlen);
247 if (block_acl(dst, csp))
250 socket_error = errno = SOCEPERM;
252 socket_error = errno = EPERM;
256 #endif /* def FEATURE_ACL */
258 retval = getnameinfo(rp->ai_addr, rp->ai_addrlen,
259 csp->http->host_ip_addr_str, NI_MAXHOST, NULL, 0, NI_NUMERICHOST);
262 log_error(LOG_LEVEL_ERROR,
263 "Failed to get the host name from the socket structure: %s",
264 gai_strerror(retval));
268 fd = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol);
270 if (fd == JB_INVALID_SOCKET)
279 { /* turn off TCP coalescence */
281 setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, (char *) &mi, sizeof (int));
283 #endif /* def TCP_NODELAY */
285 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
286 if ((flags = fcntl(fd, F_GETFL, 0)) != -1)
289 fcntl(fd, F_SETFL, flags);
291 #endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__) */
294 while (connect(fd, rp->ai_addr, rp->ai_addrlen) == JB_INVALID_SOCKET)
297 errno = sock_errno();
301 if (errno == WSAEINPROGRESS)
302 #else /* ifndef _WIN32 */
303 if (errno == EINPROGRESS)
304 #endif /* ndef _WIN32 || __OS2__ */
321 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
325 fcntl(fd, F_SETFL, flags);
327 #endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__) */
329 /* wait for connection to complete */
333 memset(&timeout, 0, sizeof(timeout));
336 /* MS Windows uses int, not SOCKET, for the 1st arg of select(). Wierd! */
337 if ((select((int)fd + 1, NULL, &wfds, NULL, &timeout) > 0)
338 && FD_ISSET(fd, &wfds))
340 socklen_t optlen = sizeof(socket_error);
341 if (!getsockopt(fd, SOL_SOCKET, SO_ERROR, &socket_error, &optlen))
345 /* Connection established, no need to try other addresses. */
348 log_error(LOG_LEVEL_CONNECT, "Could not connect to [%s]:%s: %s.",
349 csp->http->host_ip_addr_str, service, strerror(socket_error));
353 socket_error = errno;
354 log_error(LOG_LEVEL_ERROR, "Could not get the state of "
355 "the connection to [%s]:%s: %s; dropping connection.",
356 csp->http->host_ip_addr_str, service, strerror(errno));
360 /* Connection failed, try next address */
364 freeaddrinfo(result);
367 log_error(LOG_LEVEL_CONNECT, "Could not connect to [%s]:%s: %s.",
368 host, service, strerror(socket_error));
369 csp->error_message = strdup(strerror(socket_error));
370 return(JB_INVALID_SOCKET);
372 log_error(LOG_LEVEL_CONNECT, "Connected to %s[%s]:%s.",
373 host, csp->http->host_ip_addr_str, service);
379 #else /* ndef HAVE_RFC2553 */
380 /* Pre-getaddrinfo implementation */
382 static jb_socket no_rfc2553_connect_to(const char *host, int portnum, struct client_state *csp)
384 struct sockaddr_in inaddr;
388 struct timeval tv[1];
389 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
394 struct access_control_addr dst[1];
395 #endif /* def FEATURE_ACL */
397 /* Don't leak memory when retrying. */
398 freez(csp->http->host_ip_addr_str);
400 memset((char *)&inaddr, 0, sizeof inaddr);
402 if ((addr = resolve_hostname_to_ip(host)) == INADDR_NONE)
404 csp->http->host_ip_addr_str = strdup("unknown");
405 return(JB_INVALID_SOCKET);
409 dst->addr = ntohl(addr);
412 if (block_acl(dst, csp))
419 return(JB_INVALID_SOCKET);
421 #endif /* def FEATURE_ACL */
423 inaddr.sin_addr.s_addr = addr;
424 inaddr.sin_family = AF_INET;
425 csp->http->host_ip_addr_str = strdup(inet_ntoa(inaddr.sin_addr));
428 if (sizeof(inaddr.sin_port) == sizeof(short))
429 #endif /* ndef _WIN32 */
431 inaddr.sin_port = htons((unsigned short) portnum);
436 inaddr.sin_port = htonl((unsigned long)portnum);
438 #endif /* ndef _WIN32 */
440 fd = socket(inaddr.sin_family, SOCK_STREAM, 0);
442 if (fd == JB_INVALID_SOCKET)
447 return(JB_INVALID_SOCKET);
451 { /* turn off TCP coalescence */
453 setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, (char *) &mi, sizeof (int));
455 #endif /* def TCP_NODELAY */
457 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
458 if ((flags = fcntl(fd, F_GETFL, 0)) != -1)
461 fcntl(fd, F_SETFL, flags);
463 #endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__) */
465 while (connect(fd, (struct sockaddr *) & inaddr, sizeof inaddr) == JB_INVALID_SOCKET)
468 if (errno == WSAEINPROGRESS)
470 if (sock_errno() == EINPROGRESS)
471 #else /* ifndef _WIN32 */
472 if (errno == EINPROGRESS)
473 #endif /* ndef _WIN32 || __OS2__ */
479 if (sock_errno() != EINTR)
485 return(JB_INVALID_SOCKET);
489 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
493 fcntl(fd, F_SETFL, flags);
495 #endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__) */
497 /* wait for connection to complete */
504 /* MS Windows uses int, not SOCKET, for the 1st arg of select(). Wierd! */
505 if (select((int)fd + 1, NULL, &wfds, NULL, tv) <= 0)
508 return(JB_INVALID_SOCKET);
513 #endif /* ndef HAVE_RFC2553 */
516 /*********************************************************************
518 * Function : write_socket
520 * Description : Write the contents of buf (for n bytes) to socket fd.
523 * 1 : fd = file descriptor (aka. handle) of socket to write to.
524 * 2 : buf = pointer to data to be written.
525 * 3 : len = length of data to be written to the socket "fd".
527 * Returns : 0 on success (entire buffer sent).
530 *********************************************************************/
532 int write_socket(jb_socket fd, const char *buf, ssize_t len)
534 int write_socket(jb_socket fd, const char *buf, size_t len)
542 if (len < 0) /* constant condition - size_t isn't ever negative */
547 log_error(LOG_LEVEL_WRITING, "to socket %d: %N", fd, len, buf);
550 return (send(fd, buf, (int)len, 0) != (int)len);
551 #elif defined(__BEOS__) || defined(AMIGA)
552 return (send(fd, buf, len, 0) != len);
553 #elif defined(__OS2__)
555 * Break the data up into SOCKET_SEND_MAX chunks for sending...
556 * OS/2 seemed to complain when the chunks were too large.
558 #define SOCKET_SEND_MAX 65000
560 int send_len, send_rc = 0, i = 0;
561 while ((i < len) && (send_rc != -1))
563 if ((i + SOCKET_SEND_MAX) > len)
566 send_len = SOCKET_SEND_MAX;
567 send_rc = send(fd,(char*)buf + i, send_len, 0);
575 return (write(fd, buf, len) != len);
581 /*********************************************************************
583 * Function : read_socket
585 * Description : Read from a TCP/IP socket in a platform independent way.
588 * 1 : fd = file descriptor of the socket to read
589 * 2 : buf = pointer to buffer where data will be written
590 * Must be >= len bytes long.
591 * 3 : len = maximum number of bytes to read
593 * Returns : On success, the number of bytes read is returned (zero
594 * indicates end of file), and the file position is advanced
595 * by this number. It is not an error if this number is
596 * smaller than the number of bytes requested; this may hap-
597 * pen for example because fewer bytes are actually available
598 * right now (maybe because we were close to end-of-file, or
599 * because we are reading from a pipe, or from a terminal,
600 * or because read() was interrupted by a signal). On error,
601 * -1 is returned, and errno is set appropriately. In this
602 * case it is left unspecified whether the file position (if
605 *********************************************************************/
606 int read_socket(jb_socket fd, char *buf, int len)
616 ret = recv(fd, buf, len, 0);
617 #elif defined(__BEOS__) || defined(AMIGA) || defined(__OS2__)
618 ret = recv(fd, buf, (size_t)len, 0);
620 ret = (int)read(fd, buf, (size_t)len);
625 log_error(LOG_LEVEL_RECEIVED, "from socket %d: %N", fd, ret, buf);
632 /*********************************************************************
634 * Function : data_is_available
636 * Description : Waits for data to arrive on a socket.
639 * 1 : fd = file descriptor of the socket to read
640 * 2 : seconds_to_wait = number of seconds after which we give up.
642 * Returns : TRUE if data arrived in time,
645 *********************************************************************/
646 int data_is_available(jb_socket fd, int seconds_to_wait)
650 struct timeval timeout;
653 memset(&timeout, 0, sizeof(timeout));
654 timeout.tv_sec = seconds_to_wait;
657 /* Copy and pasted from jcc.c ... */
658 memset(&rfds, 0, sizeof(fd_set));
664 n = select(fd+1, &rfds, NULL, NULL, &timeout);
667 * XXX: Do we care about the different error conditions?
669 return ((n == 1) && (1 == recv(fd, buf, 1, MSG_PEEK)));
673 /*********************************************************************
675 * Function : close_socket
677 * Description : Closes a TCP/IP socket
680 * 1 : fd = file descriptor of socket to be closed
684 *********************************************************************/
685 void close_socket(jb_socket fd)
687 #if defined(_WIN32) || defined(__BEOS__)
691 #elif defined(__OS2__)
700 /*********************************************************************
702 * Function : bind_port
704 * Description : Call socket, set socket options, and listen.
705 * Called by listen_loop to "boot up" our proxy address.
708 * 1 : hostnam = TCP/IP address to bind/listen to
709 * 2 : portnum = port to listen on
710 * 3 : pfd = pointer used to return file descriptor.
712 * Returns : if success, returns 0 and sets *pfd.
713 * if failure, returns -3 if address is in use,
714 * -2 if address unresolvable,
716 *********************************************************************/
717 int bind_port(const char *hostnam, int portnum, jb_socket *pfd)
720 struct addrinfo hints;
721 struct addrinfo *result, *rp;
723 * XXX: portnum should be a string to allow symbolic service
724 * names in the configuration file and to avoid the following
730 struct sockaddr_in inaddr;
731 #endif /* def HAVE_RFC2553 */
735 #endif /* ndef _WIN32 */
737 *pfd = JB_INVALID_SOCKET;
740 retval = snprintf(servnam, sizeof(servnam), "%d", portnum);
741 if ((-1 == retval) || (sizeof(servnam) <= retval))
743 log_error(LOG_LEVEL_ERROR,
744 "Port number (%d) ASCII decimal representation doesn't fit into 6 bytes",
749 memset(&hints, 0, sizeof(struct addrinfo));
753 * XXX: This is a hack. The right thing to do
754 * would be to bind to both AF_INET and AF_INET6.
755 * This will also fail if there is no AF_INET
758 hints.ai_family = AF_INET;
762 hints.ai_family = AF_UNSPEC;
764 hints.ai_socktype = SOCK_STREAM;
765 hints.ai_flags = AI_PASSIVE;
767 hints.ai_flags |= AI_ADDRCONFIG;
769 hints.ai_protocol = 0; /* Realy any stream protocol or TCP only */
770 hints.ai_canonname = NULL;
771 hints.ai_addr = NULL;
772 hints.ai_next = NULL;
774 if ((retval = getaddrinfo(hostnam, servnam, &hints, &result)))
776 log_error(LOG_LEVEL_ERROR,
777 "Can not resolve %s: %s", hostnam, gai_strerror(retval));
781 memset((char *)&inaddr, '\0', sizeof inaddr);
783 inaddr.sin_family = AF_INET;
784 inaddr.sin_addr.s_addr = resolve_hostname_to_ip(hostnam);
786 if (inaddr.sin_addr.s_addr == INADDR_NONE)
792 if (sizeof(inaddr.sin_port) == sizeof(short))
793 #endif /* ndef _WIN32 */
795 inaddr.sin_port = htons((unsigned short) portnum);
800 inaddr.sin_port = htonl((unsigned long) portnum);
802 #endif /* ndef _WIN32 */
803 #endif /* def HAVE_RFC2553 */
806 for (rp = result; rp != NULL; rp = rp->ai_next)
808 fd = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol);
810 fd = socket(AF_INET, SOCK_STREAM, 0);
811 #endif /* def HAVE_RFC2553 */
814 if (fd == JB_INVALID_SOCKET)
828 * This is not needed for Win32 - in fact, it stops
829 * duplicate instances of Privoxy from being caught.
831 * On UNIX, we assume the user is sensible enough not
832 * to start Privoxy multiple times on the same IP.
833 * Without this, stopping and restarting Privoxy
834 * from a script fails.
835 * Note: SO_REUSEADDR is meant to only take over
836 * sockets which are *not* in listen state in Linux,
837 * e.g. sockets in TIME_WAIT. YMMV.
839 setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char *)&one, sizeof(one));
840 #endif /* ndef _WIN32 */
843 if (bind(fd, rp->ai_addr, rp->ai_addrlen) < 0)
845 if (bind(fd, (struct sockaddr *)&inaddr, sizeof(inaddr)) < 0)
849 errno = WSAGetLastError();
850 if (errno == WSAEADDRINUSE)
852 if (errno == EADDRINUSE)
856 freeaddrinfo(result);
873 /* bind() succeeded, escape from for-loop */
875 * XXX: Support multiple listening sockets (e.g. localhost
876 * resolves to AF_INET and AF_INET6, but only the first address
883 freeaddrinfo(result);
886 /* All bind()s failed */
889 #endif /* ndef HAVE_RFC2553 */
891 while (listen(fd, MAX_LISTEN_BACKLOG) == -1)
905 /*********************************************************************
907 * Function : get_host_information
909 * Description : Determines the IP address the client used to
910 * reach us and the hostname associated with it.
912 * XXX: Most of the code has been copy and pasted
913 * from accept_connection() and not all of the
914 * ifdefs paths have been tested afterwards.
917 * 1 : afd = File descriptor returned from accept().
918 * 2 : ip_address = Pointer to return the pointer to
919 * the ip address string.
920 * 3 : hostname = Pointer to return the pointer to
921 * the hostname or NULL if the caller
922 * isn't interested in it.
926 *********************************************************************/
927 void get_host_information(jb_socket afd, char **ip_address, char **hostname)
930 struct sockaddr_storage server;
933 struct sockaddr_in server;
934 struct hostent *host = NULL;
935 #endif /* HAVE_RFC2553 */
936 #if defined(_WIN32) || defined(__OS2__) || defined(__APPLE_CC__) || defined(AMIGA)
937 /* according to accept_connection() this fixes a warning. */
938 int s_length, s_length_provided;
940 socklen_t s_length, s_length_provided;
943 #if defined(HAVE_GETHOSTBYADDR_R_8_ARGS) || defined(HAVE_GETHOSTBYADDR_R_7_ARGS) || defined(HAVE_GETHOSTBYADDR_R_5_ARGS)
944 struct hostent result;
945 #if defined(HAVE_GETHOSTBYADDR_R_5_ARGS)
946 struct hostent_data hdata;
948 char hbuf[HOSTENT_BUFFER_SIZE];
950 #endif /* def HAVE_GETHOSTBYADDR_R_5_ARGS */
951 #endif /* def HAVE_GETHOSTBYADDR_R_(8|7|5)_ARGS */
952 #endif /* ifndef HAVE_RFC2553 */
953 s_length = s_length_provided = sizeof(server);
955 if (NULL != hostname)
961 if (!getsockname(afd, (struct sockaddr *) &server, &s_length))
963 if (s_length > s_length_provided)
965 log_error(LOG_LEVEL_ERROR, "getsockname() truncated server address");
969 *ip_address = malloc(NI_MAXHOST);
970 if (NULL == *ip_address)
972 log_error(LOG_LEVEL_ERROR,
973 "Out of memory while getting the client's IP address.");
976 retval = getnameinfo((struct sockaddr *) &server, s_length,
977 *ip_address, NI_MAXHOST, NULL, 0, NI_NUMERICHOST);
980 log_error(LOG_LEVEL_ERROR,
981 "Unable to print my own IP address: %s", gai_strerror(retval));
986 *ip_address = strdup(inet_ntoa(server.sin_addr));
987 #endif /* HAVE_RFC2553 */
988 if (NULL == hostname)
991 * We're done here, the caller isn't
992 * interested in knowing the hostname.
998 *hostname = malloc(NI_MAXHOST);
999 if (NULL == *hostname)
1001 log_error(LOG_LEVEL_ERROR,
1002 "Out of memory while getting the client's hostname.");
1005 retval = getnameinfo((struct sockaddr *) &server, s_length,
1006 *hostname, NI_MAXHOST, NULL, 0, NI_NAMEREQD);
1009 log_error(LOG_LEVEL_ERROR,
1010 "Unable to resolve my own IP address: %s", gai_strerror(retval));
1014 #if defined(HAVE_GETHOSTBYADDR_R_8_ARGS)
1015 gethostbyaddr_r((const char *)&server.sin_addr,
1016 sizeof(server.sin_addr), AF_INET,
1017 &result, hbuf, HOSTENT_BUFFER_SIZE,
1019 #elif defined(HAVE_GETHOSTBYADDR_R_7_ARGS)
1020 host = gethostbyaddr_r((const char *)&server.sin_addr,
1021 sizeof(server.sin_addr), AF_INET,
1022 &result, hbuf, HOSTENT_BUFFER_SIZE, &thd_err);
1023 #elif defined(HAVE_GETHOSTBYADDR_R_5_ARGS)
1024 if (0 == gethostbyaddr_r((const char *)&server.sin_addr,
1025 sizeof(server.sin_addr), AF_INET,
1034 #elif defined(MUTEX_LOCKS_AVAILABLE)
1035 privoxy_mutex_lock(&resolver_mutex);
1036 host = gethostbyaddr((const char *)&server.sin_addr,
1037 sizeof(server.sin_addr), AF_INET);
1038 privoxy_mutex_unlock(&resolver_mutex);
1040 host = gethostbyaddr((const char *)&server.sin_addr,
1041 sizeof(server.sin_addr), AF_INET);
1045 log_error(LOG_LEVEL_ERROR, "Unable to get my own hostname: %E\n");
1049 *hostname = strdup(host->h_name);
1051 #endif /* else def HAVE_RFC2553 */
1058 /*********************************************************************
1060 * Function : accept_connection
1062 * Description : Accepts a connection on a socket. Socket must have
1063 * been created using bind_port().
1066 * 1 : csp = Client state, cfd, ip_addr_str, and
1067 * ip_addr_long will be set by this routine.
1068 * 2 : fd = file descriptor returned from bind_port
1070 * Returns : when a connection is accepted, it returns 1 (TRUE).
1071 * On an error it returns 0 (FALSE).
1073 *********************************************************************/
1074 int accept_connection(struct client_state * csp, jb_socket fd)
1077 /* XXX: client is stored directly into csp->tcp_addr */
1078 #define client (csp->tcp_addr)
1081 struct sockaddr_in client;
1084 #if defined(_WIN32) || defined(__OS2__) || defined(__APPLE_CC__) || defined(AMIGA)
1085 /* Wierdness - fix a warning. */
1091 c_length = sizeof(client);
1094 afd = accept (fd, (struct sockaddr *) &client, &c_length);
1095 if (afd == JB_INVALID_SOCKET)
1102 #if defined(FEATURE_ACCEPT_FILTER) && defined(SO_ACCEPTFILTER)
1103 struct accept_filter_arg af_options;
1104 bzero(&af_options, sizeof(af_options));
1105 strlcpy(af_options.af_name, "httpready", sizeof(af_options.af_name));
1106 setsockopt(fd, SOL_SOCKET, SO_ACCEPTFILTER, &af_options, sizeof(af_options));
1108 afd = accept (fd, (struct sockaddr *) &client, &c_length);
1109 } while (afd < 1 && errno == EINTR);
1118 csp->ip_addr_str = malloc(NI_MAXHOST);
1119 if (NULL == csp->ip_addr_str)
1121 log_error(LOG_LEVEL_ERROR,
1122 "Out of memory while getting the client's IP address.");
1125 retval = getnameinfo((struct sockaddr *) &client, c_length,
1126 csp->ip_addr_str, NI_MAXHOST, NULL, 0, NI_NUMERICHOST);
1127 if (!csp->ip_addr_str || retval)
1129 log_error(LOG_LEVEL_ERROR, "Can not save csp->ip_addr_str: %s",
1130 (csp->ip_addr_str) ? gai_strerror(retval) : "Insuffcient memory");
1131 freez(csp->ip_addr_str);
1135 csp->ip_addr_str = strdup(inet_ntoa(client.sin_addr));
1136 csp->ip_addr_long = ntohl(client.sin_addr.s_addr);
1137 #endif /* def HAVE_RFC2553 */
1144 /*********************************************************************
1146 * Function : resolve_hostname_to_ip
1148 * Description : Resolve a hostname to an internet tcp/ip address.
1149 * NULL or an empty string resolve to INADDR_ANY.
1152 * 1 : host = hostname to resolve
1154 * Returns : INADDR_NONE => failure, INADDR_ANY or tcp/ip address if succesful.
1156 *********************************************************************/
1157 unsigned long resolve_hostname_to_ip(const char *host)
1159 struct sockaddr_in inaddr;
1160 struct hostent *hostp;
1161 #if defined(HAVE_GETHOSTBYNAME_R_6_ARGS) || defined(HAVE_GETHOSTBYNAME_R_5_ARGS) || defined(HAVE_GETHOSTBYNAME_R_3_ARGS)
1162 struct hostent result;
1163 #if defined(HAVE_GETHOSTBYNAME_R_6_ARGS) || defined(HAVE_GETHOSTBYNAME_R_5_ARGS)
1164 char hbuf[HOSTENT_BUFFER_SIZE];
1166 #else /* defined(HAVE_GETHOSTBYNAME_R_3_ARGS) */
1167 struct hostent_data hdata;
1168 #endif /* def HAVE_GETHOSTBYNAME_R_(6|5)_ARGS */
1169 #endif /* def HAVE_GETHOSTBYNAME_R_(6|5|3)_ARGS */
1171 if ((host == NULL) || (*host == '\0'))
1176 memset((char *) &inaddr, 0, sizeof inaddr);
1178 if ((inaddr.sin_addr.s_addr = inet_addr(host)) == -1)
1180 unsigned int dns_retries = 0;
1181 #if defined(HAVE_GETHOSTBYNAME_R_6_ARGS)
1182 while (gethostbyname_r(host, &result, hbuf,
1183 HOSTENT_BUFFER_SIZE, &hostp, &thd_err)
1184 && (thd_err == TRY_AGAIN) && (dns_retries++ < MAX_DNS_RETRIES))
1186 log_error(LOG_LEVEL_ERROR,
1187 "Timeout #%u while trying to resolve %s. Trying again.",
1190 #elif defined(HAVE_GETHOSTBYNAME_R_5_ARGS)
1191 while (NULL == (hostp = gethostbyname_r(host, &result,
1192 hbuf, HOSTENT_BUFFER_SIZE, &thd_err))
1193 && (thd_err == TRY_AGAIN) && (dns_retries++ < MAX_DNS_RETRIES))
1195 log_error(LOG_LEVEL_ERROR,
1196 "Timeout #%u while trying to resolve %s. Trying again.",
1199 #elif defined(HAVE_GETHOSTBYNAME_R_3_ARGS)
1201 * XXX: Doesn't retry in case of soft errors.
1202 * Does this gethostbyname_r version set h_errno?
1204 if (0 == gethostbyname_r(host, &result, &hdata))
1212 #elif defined(MUTEX_LOCKS_AVAILABLE)
1213 privoxy_mutex_lock(&resolver_mutex);
1214 while (NULL == (hostp = gethostbyname(host))
1215 && (h_errno == TRY_AGAIN) && (dns_retries++ < MAX_DNS_RETRIES))
1217 log_error(LOG_LEVEL_ERROR,
1218 "Timeout #%u while trying to resolve %s. Trying again.",
1221 privoxy_mutex_unlock(&resolver_mutex);
1223 while (NULL == (hostp = gethostbyname(host))
1224 && (h_errno == TRY_AGAIN) && (dns_retries++ < MAX_DNS_RETRIES))
1226 log_error(LOG_LEVEL_ERROR,
1227 "Timeout #%u while trying to resolve %s. Trying again.",
1230 #endif /* def HAVE_GETHOSTBYNAME_R_(6|5|3)_ARGS */
1232 * On Mac OSX, if a domain exists but doesn't have a type A
1233 * record associated with it, the h_addr member of the struct
1234 * hostent returned by gethostbyname is NULL, even if h_length
1235 * is 4. Therefore the second test below.
1237 if (hostp == NULL || hostp->h_addr == NULL)
1240 log_error(LOG_LEVEL_ERROR, "could not resolve hostname %s", host);
1241 return(INADDR_NONE);
1243 if (hostp->h_addrtype != AF_INET)
1246 errno = WSAEPROTOTYPE;
1250 log_error(LOG_LEVEL_ERROR, "hostname %s resolves to unknown address type.", host);
1251 return(INADDR_NONE);
1254 (char *) &inaddr.sin_addr,
1255 (char *) hostp->h_addr,
1256 sizeof(inaddr.sin_addr)
1259 return(inaddr.sin_addr.s_addr);
1264 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
1265 /*********************************************************************
1267 * Function : socket_is_still_alive
1269 * Description : Figures out whether or not a socket is still alive.
1272 * 1 : sfd = The socket to check.
1274 * Returns : TRUE for yes, otherwise FALSE.
1276 *********************************************************************/
1277 int socket_is_still_alive(jb_socket sfd)
1280 int no_data_waiting;
1284 struct pollfd poll_fd[1];
1286 memset(poll_fd, 0, sizeof(poll_fd));
1287 poll_fd[0].fd = sfd;
1288 poll_fd[0].events = POLLIN;
1290 poll_result = poll(poll_fd, 1, 0);
1292 if (-1 == poll_result)
1294 log_error(LOG_LEVEL_CONNECT, "Polling socket %d failed.", sfd);
1297 no_data_waiting = !(poll_fd[0].revents & POLLIN);
1299 fd_set readable_fds;
1300 struct timeval timeout;
1303 memset(&timeout, '\0', sizeof(timeout));
1304 FD_ZERO(&readable_fds);
1305 FD_SET(sfd, &readable_fds);
1307 ret = select((int)sfd+1, &readable_fds, NULL, NULL, &timeout);
1310 log_error(LOG_LEVEL_CONNECT, "select() on socket %d failed: %E", sfd);
1313 no_data_waiting = !FD_ISSET(sfd, &readable_fds);
1314 #endif /* def HAVE_POLL */
1316 return (no_data_waiting || (1 == recv(sfd, buf, 1, MSG_PEEK)));
1318 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */