1 const char jbsockets_rcs[] = "$Id: jbsockets.c,v 1.101 2011/05/03 09:55:35 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)
161 || (csp->fwd == NULL)
162 || ((csp->fwd->forward_host == NULL) && (csp->fwd->type == SOCKS_NONE)))
166 forwarded_connect_retries++;
167 if (csp->config->forwarded_connect_retries != 0)
169 log_error(LOG_LEVEL_ERROR,
170 "Attempt %d of %d to connect to %s failed. Trying again.",
171 forwarded_connect_retries, csp->config->forwarded_connect_retries, host);
174 } while (forwarded_connect_retries < csp->config->forwarded_connect_retries);
180 /* Getaddrinfo implementation */
181 static jb_socket rfc2553_connect_to(const char *host, int portnum, struct client_state *csp)
183 struct addrinfo hints, *result, *rp;
188 struct timeval timeout;
189 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
194 * XXX: Initializeing it here is only necessary
195 * because not all situations are properly
198 int socket_error = 0;
201 struct access_control_addr dst[1];
202 #endif /* def FEATURE_ACL */
204 /* Don't leak memory when retrying. */
205 freez(csp->error_message);
206 freez(csp->http->host_ip_addr_str);
208 retval = snprintf(service, sizeof(service), "%d", portnum);
209 if ((-1 == retval) || (sizeof(service) <= retval))
211 log_error(LOG_LEVEL_ERROR,
212 "Port number (%d) ASCII decimal representation doesn't fit into 6 bytes",
214 csp->error_message = strdup("Invalid port number");
215 csp->http->host_ip_addr_str = strdup("unknown");
216 return(JB_INVALID_SOCKET);
219 memset((char *)&hints, 0, sizeof(hints));
220 hints.ai_family = AF_UNSPEC;
221 hints.ai_socktype = SOCK_STREAM;
222 hints.ai_flags = AI_NUMERICSERV; /* avoid service look-up */
224 hints.ai_flags |= AI_ADDRCONFIG;
226 if ((retval = getaddrinfo(host, service, &hints, &result)))
228 log_error(LOG_LEVEL_INFO,
229 "Can not resolve %s: %s", host, gai_strerror(retval));
230 /* XXX: Should find a better way to propagate this error. */
232 csp->error_message = strdup(gai_strerror(retval));
233 csp->http->host_ip_addr_str = strdup("unknown");
234 return(JB_INVALID_SOCKET);
237 csp->http->host_ip_addr_str = malloc(NI_MAXHOST);
238 if (NULL == csp->http->host_ip_addr_str)
240 freeaddrinfo(result);
241 log_error(LOG_LEVEL_ERROR,
242 "Out of memory while getting the server IP address.");
243 return JB_INVALID_SOCKET;
246 for (rp = result; rp != NULL; rp = rp->ai_next)
250 memcpy(&dst->addr, rp->ai_addr, rp->ai_addrlen);
252 if (block_acl(dst, csp))
255 socket_error = errno = SOCEPERM;
257 socket_error = errno = EPERM;
261 #endif /* def FEATURE_ACL */
263 retval = getnameinfo(rp->ai_addr, rp->ai_addrlen,
264 csp->http->host_ip_addr_str, NI_MAXHOST, NULL, 0, NI_NUMERICHOST);
267 log_error(LOG_LEVEL_ERROR,
268 "Failed to get the host name from the socket structure: %s",
269 gai_strerror(retval));
273 fd = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol);
275 if (fd == JB_INVALID_SOCKET)
284 { /* turn off TCP coalescence */
286 setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, (char *) &mi, sizeof (int));
288 #endif /* def TCP_NODELAY */
290 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
291 if ((flags = fcntl(fd, F_GETFL, 0)) != -1)
294 fcntl(fd, F_SETFL, flags);
296 #endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__) */
299 while (connect(fd, rp->ai_addr, rp->ai_addrlen) == JB_INVALID_SOCKET)
302 errno = sock_errno();
306 if (errno == WSAEINPROGRESS)
307 #else /* ifndef _WIN32 */
308 if (errno == EINPROGRESS)
309 #endif /* ndef _WIN32 || __OS2__ */
326 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
330 fcntl(fd, F_SETFL, flags);
332 #endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__) */
334 /* wait for connection to complete */
338 memset(&timeout, 0, sizeof(timeout));
341 /* MS Windows uses int, not SOCKET, for the 1st arg of select(). Weird! */
342 if ((select((int)fd + 1, NULL, &wfds, NULL, &timeout) > 0)
343 && FD_ISSET(fd, &wfds))
345 socklen_t optlen = sizeof(socket_error);
346 if (!getsockopt(fd, SOL_SOCKET, SO_ERROR, &socket_error, &optlen))
350 /* Connection established, no need to try other addresses. */
353 if (rp->ai_next != NULL)
356 * There's another address we can try, so log that this
357 * one didn't work out. If the last one fails, too,
358 * it will get logged outside the loop body so we don't
359 * have to mention it here.
361 log_error(LOG_LEVEL_CONNECT, "Could not connect to [%s]:%s: %s.",
362 csp->http->host_ip_addr_str, service, strerror(socket_error));
367 socket_error = errno;
368 log_error(LOG_LEVEL_ERROR, "Could not get the state of "
369 "the connection to [%s]:%s: %s; dropping connection.",
370 csp->http->host_ip_addr_str, service, strerror(errno));
374 /* Connection failed, try next address */
378 freeaddrinfo(result);
381 log_error(LOG_LEVEL_CONNECT, "Could not connect to [%s]:%s: %s.",
382 host, service, strerror(socket_error));
383 csp->error_message = strdup(strerror(socket_error));
384 return(JB_INVALID_SOCKET);
386 log_error(LOG_LEVEL_CONNECT, "Connected to %s[%s]:%s.",
387 host, csp->http->host_ip_addr_str, service);
393 #else /* ndef HAVE_RFC2553 */
394 /* Pre-getaddrinfo implementation */
396 static jb_socket no_rfc2553_connect_to(const char *host, int portnum, struct client_state *csp)
398 struct sockaddr_in inaddr;
402 struct timeval tv[1];
403 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
408 struct access_control_addr dst[1];
409 #endif /* def FEATURE_ACL */
411 /* Don't leak memory when retrying. */
412 freez(csp->http->host_ip_addr_str);
414 memset((char *)&inaddr, 0, sizeof inaddr);
416 if ((addr = resolve_hostname_to_ip(host)) == INADDR_NONE)
418 csp->http->host_ip_addr_str = strdup("unknown");
419 return(JB_INVALID_SOCKET);
423 dst->addr = ntohl(addr);
426 if (block_acl(dst, csp))
433 return(JB_INVALID_SOCKET);
435 #endif /* def FEATURE_ACL */
437 inaddr.sin_addr.s_addr = addr;
438 inaddr.sin_family = AF_INET;
439 csp->http->host_ip_addr_str = strdup(inet_ntoa(inaddr.sin_addr));
442 if (sizeof(inaddr.sin_port) == sizeof(short))
443 #endif /* ndef _WIN32 */
445 inaddr.sin_port = htons((unsigned short) portnum);
450 inaddr.sin_port = htonl((unsigned long)portnum);
452 #endif /* ndef _WIN32 */
454 fd = socket(inaddr.sin_family, SOCK_STREAM, 0);
456 if (fd == JB_INVALID_SOCKET)
461 return(JB_INVALID_SOCKET);
465 { /* turn off TCP coalescence */
467 setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, (char *) &mi, sizeof (int));
469 #endif /* def TCP_NODELAY */
471 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
472 if ((flags = fcntl(fd, F_GETFL, 0)) != -1)
475 fcntl(fd, F_SETFL, flags);
477 #endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__) */
479 while (connect(fd, (struct sockaddr *) & inaddr, sizeof inaddr) == JB_INVALID_SOCKET)
482 if (errno == WSAEINPROGRESS)
484 if (sock_errno() == EINPROGRESS)
485 #else /* ifndef _WIN32 */
486 if (errno == EINPROGRESS)
487 #endif /* ndef _WIN32 || __OS2__ */
493 if (sock_errno() != EINTR)
499 return(JB_INVALID_SOCKET);
503 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
507 fcntl(fd, F_SETFL, flags);
509 #endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__) */
511 /* wait for connection to complete */
518 /* MS Windows uses int, not SOCKET, for the 1st arg of select(). Weird! */
519 if (select((int)fd + 1, NULL, &wfds, NULL, tv) <= 0)
522 return(JB_INVALID_SOCKET);
527 #endif /* ndef HAVE_RFC2553 */
530 /*********************************************************************
532 * Function : write_socket
534 * Description : Write the contents of buf (for n bytes) to socket fd.
537 * 1 : fd = file descriptor (aka. handle) of socket to write to.
538 * 2 : buf = pointer to data to be written.
539 * 3 : len = length of data to be written to the socket "fd".
541 * Returns : 0 on success (entire buffer sent).
544 *********************************************************************/
546 int write_socket(jb_socket fd, const char *buf, ssize_t len)
548 int write_socket(jb_socket fd, const char *buf, size_t len)
556 if (len < 0) /* constant condition - size_t isn't ever negative */
561 log_error(LOG_LEVEL_WRITING, "to socket %d: %N", fd, len, buf);
564 return (send(fd, buf, (int)len, 0) != (int)len);
565 #elif defined(__BEOS__) || defined(AMIGA)
566 return (send(fd, buf, len, 0) != len);
567 #elif defined(__OS2__)
569 * Break the data up into SOCKET_SEND_MAX chunks for sending...
570 * OS/2 seemed to complain when the chunks were too large.
572 #define SOCKET_SEND_MAX 65000
574 int send_len, send_rc = 0, i = 0;
575 while ((i < len) && (send_rc != -1))
577 if ((i + SOCKET_SEND_MAX) > len)
580 send_len = SOCKET_SEND_MAX;
581 send_rc = send(fd,(char*)buf + i, send_len, 0);
589 return (write(fd, buf, len) != len);
595 /*********************************************************************
597 * Function : read_socket
599 * Description : Read from a TCP/IP socket in a platform independent way.
602 * 1 : fd = file descriptor of the socket to read
603 * 2 : buf = pointer to buffer where data will be written
604 * Must be >= len bytes long.
605 * 3 : len = maximum number of bytes to read
607 * Returns : On success, the number of bytes read is returned (zero
608 * indicates end of file), and the file position is advanced
609 * by this number. It is not an error if this number is
610 * smaller than the number of bytes requested; this may hap-
611 * pen for example because fewer bytes are actually available
612 * right now (maybe because we were close to end-of-file, or
613 * because we are reading from a pipe, or from a terminal,
614 * or because read() was interrupted by a signal). On error,
615 * -1 is returned, and errno is set appropriately. In this
616 * case it is left unspecified whether the file position (if
619 *********************************************************************/
620 int read_socket(jb_socket fd, char *buf, int len)
630 ret = recv(fd, buf, len, 0);
631 #elif defined(__BEOS__) || defined(AMIGA) || defined(__OS2__)
632 ret = recv(fd, buf, (size_t)len, 0);
634 ret = (int)read(fd, buf, (size_t)len);
639 log_error(LOG_LEVEL_RECEIVED, "from socket %d: %N", fd, ret, buf);
646 /*********************************************************************
648 * Function : data_is_available
650 * Description : Waits for data to arrive on a socket.
653 * 1 : fd = file descriptor of the socket to read
654 * 2 : seconds_to_wait = number of seconds after which we give up.
656 * Returns : TRUE if data arrived in time,
659 *********************************************************************/
660 int data_is_available(jb_socket fd, int seconds_to_wait)
664 struct timeval timeout;
667 memset(&timeout, 0, sizeof(timeout));
668 timeout.tv_sec = seconds_to_wait;
671 /* Copy and pasted from jcc.c ... */
672 memset(&rfds, 0, sizeof(fd_set));
678 n = select(fd+1, &rfds, NULL, NULL, &timeout);
681 * XXX: Do we care about the different error conditions?
683 return ((n == 1) && (1 == recv(fd, buf, 1, MSG_PEEK)));
687 /*********************************************************************
689 * Function : close_socket
691 * Description : Closes a TCP/IP socket
694 * 1 : fd = file descriptor of socket to be closed
698 *********************************************************************/
699 void close_socket(jb_socket fd)
701 #if defined(_WIN32) || defined(__BEOS__)
705 #elif defined(__OS2__)
714 /*********************************************************************
716 * Function : bind_port
718 * Description : Call socket, set socket options, and listen.
719 * Called by listen_loop to "boot up" our proxy address.
722 * 1 : hostnam = TCP/IP address to bind/listen to
723 * 2 : portnum = port to listen on
724 * 3 : pfd = pointer used to return file descriptor.
726 * Returns : if success, returns 0 and sets *pfd.
727 * if failure, returns -3 if address is in use,
728 * -2 if address unresolvable,
730 *********************************************************************/
731 int bind_port(const char *hostnam, int portnum, jb_socket *pfd)
734 struct addrinfo hints;
735 struct addrinfo *result, *rp;
737 * XXX: portnum should be a string to allow symbolic service
738 * names in the configuration file and to avoid the following
744 struct sockaddr_in inaddr;
745 #endif /* def HAVE_RFC2553 */
749 #endif /* ndef _WIN32 */
751 *pfd = JB_INVALID_SOCKET;
754 retval = snprintf(servnam, sizeof(servnam), "%d", portnum);
755 if ((-1 == retval) || (sizeof(servnam) <= retval))
757 log_error(LOG_LEVEL_ERROR,
758 "Port number (%d) ASCII decimal representation doesn't fit into 6 bytes",
763 memset(&hints, 0, sizeof(struct addrinfo));
767 * XXX: This is a hack. The right thing to do
768 * would be to bind to both AF_INET and AF_INET6.
769 * This will also fail if there is no AF_INET
772 hints.ai_family = AF_INET;
776 hints.ai_family = AF_UNSPEC;
778 hints.ai_socktype = SOCK_STREAM;
779 hints.ai_flags = AI_PASSIVE;
781 hints.ai_flags |= AI_ADDRCONFIG;
783 hints.ai_protocol = 0; /* Really any stream protocol or TCP only */
784 hints.ai_canonname = NULL;
785 hints.ai_addr = NULL;
786 hints.ai_next = NULL;
788 if ((retval = getaddrinfo(hostnam, servnam, &hints, &result)))
790 log_error(LOG_LEVEL_ERROR,
791 "Can not resolve %s: %s", hostnam, gai_strerror(retval));
795 memset((char *)&inaddr, '\0', sizeof inaddr);
797 inaddr.sin_family = AF_INET;
798 inaddr.sin_addr.s_addr = resolve_hostname_to_ip(hostnam);
800 if (inaddr.sin_addr.s_addr == INADDR_NONE)
806 if (sizeof(inaddr.sin_port) == sizeof(short))
807 #endif /* ndef _WIN32 */
809 inaddr.sin_port = htons((unsigned short) portnum);
814 inaddr.sin_port = htonl((unsigned long) portnum);
816 #endif /* ndef _WIN32 */
817 #endif /* def HAVE_RFC2553 */
820 for (rp = result; rp != NULL; rp = rp->ai_next)
822 fd = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol);
824 fd = socket(AF_INET, SOCK_STREAM, 0);
825 #endif /* def HAVE_RFC2553 */
828 if (fd == JB_INVALID_SOCKET)
842 * This is not needed for Win32 - in fact, it stops
843 * duplicate instances of Privoxy from being caught.
845 * On UNIX, we assume the user is sensible enough not
846 * to start Privoxy multiple times on the same IP.
847 * Without this, stopping and restarting Privoxy
848 * from a script fails.
849 * Note: SO_REUSEADDR is meant to only take over
850 * sockets which are *not* in listen state in Linux,
851 * e.g. sockets in TIME_WAIT. YMMV.
853 setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char *)&one, sizeof(one));
854 #endif /* ndef _WIN32 */
857 if (bind(fd, rp->ai_addr, rp->ai_addrlen) < 0)
859 if (bind(fd, (struct sockaddr *)&inaddr, sizeof(inaddr)) < 0)
863 errno = WSAGetLastError();
864 if (errno == WSAEADDRINUSE)
866 if (errno == EADDRINUSE)
870 freeaddrinfo(result);
887 /* bind() succeeded, escape from for-loop */
889 * XXX: Support multiple listening sockets (e.g. localhost
890 * resolves to AF_INET and AF_INET6, but only the first address
897 freeaddrinfo(result);
900 /* All bind()s failed */
903 #endif /* ndef HAVE_RFC2553 */
905 while (listen(fd, MAX_LISTEN_BACKLOG) == -1)
919 /*********************************************************************
921 * Function : get_host_information
923 * Description : Determines the IP address the client used to
924 * reach us and the hostname associated with it.
926 * XXX: Most of the code has been copy and pasted
927 * from accept_connection() and not all of the
928 * ifdefs paths have been tested afterwards.
931 * 1 : afd = File descriptor returned from accept().
932 * 2 : ip_address = Pointer to return the pointer to
933 * the ip address string.
934 * 3 : hostname = Pointer to return the pointer to
935 * the hostname or NULL if the caller
936 * isn't interested in it.
940 *********************************************************************/
941 void get_host_information(jb_socket afd, char **ip_address, char **hostname)
944 struct sockaddr_storage server;
947 struct sockaddr_in server;
948 struct hostent *host = NULL;
949 #endif /* HAVE_RFC2553 */
950 #if defined(_WIN32) || defined(__OS2__) || defined(__APPLE_CC__) || defined(AMIGA)
951 /* according to accept_connection() this fixes a warning. */
952 int s_length, s_length_provided;
954 socklen_t s_length, s_length_provided;
957 #if defined(HAVE_GETHOSTBYADDR_R_8_ARGS) || defined(HAVE_GETHOSTBYADDR_R_7_ARGS) || defined(HAVE_GETHOSTBYADDR_R_5_ARGS)
958 struct hostent result;
959 #if defined(HAVE_GETHOSTBYADDR_R_5_ARGS)
960 struct hostent_data hdata;
962 char hbuf[HOSTENT_BUFFER_SIZE];
964 #endif /* def HAVE_GETHOSTBYADDR_R_5_ARGS */
965 #endif /* def HAVE_GETHOSTBYADDR_R_(8|7|5)_ARGS */
966 #endif /* ifndef HAVE_RFC2553 */
967 s_length = s_length_provided = sizeof(server);
969 if (NULL != hostname)
975 if (!getsockname(afd, (struct sockaddr *) &server, &s_length))
977 if (s_length > s_length_provided)
979 log_error(LOG_LEVEL_ERROR, "getsockname() truncated server address");
983 *ip_address = malloc(NI_MAXHOST);
984 if (NULL == *ip_address)
986 log_error(LOG_LEVEL_ERROR,
987 "Out of memory while getting the client's IP address.");
990 retval = getnameinfo((struct sockaddr *) &server, s_length,
991 *ip_address, NI_MAXHOST, NULL, 0, NI_NUMERICHOST);
994 log_error(LOG_LEVEL_ERROR,
995 "Unable to print my own IP address: %s", gai_strerror(retval));
1000 *ip_address = strdup(inet_ntoa(server.sin_addr));
1001 #endif /* HAVE_RFC2553 */
1002 if (NULL == hostname)
1005 * We're done here, the caller isn't
1006 * interested in knowing the hostname.
1012 *hostname = malloc(NI_MAXHOST);
1013 if (NULL == *hostname)
1015 log_error(LOG_LEVEL_ERROR,
1016 "Out of memory while getting the client's hostname.");
1019 retval = getnameinfo((struct sockaddr *) &server, s_length,
1020 *hostname, NI_MAXHOST, NULL, 0, NI_NAMEREQD);
1023 log_error(LOG_LEVEL_ERROR,
1024 "Unable to resolve my own IP address: %s", gai_strerror(retval));
1028 #if defined(HAVE_GETHOSTBYADDR_R_8_ARGS)
1029 gethostbyaddr_r((const char *)&server.sin_addr,
1030 sizeof(server.sin_addr), AF_INET,
1031 &result, hbuf, HOSTENT_BUFFER_SIZE,
1033 #elif defined(HAVE_GETHOSTBYADDR_R_7_ARGS)
1034 host = gethostbyaddr_r((const char *)&server.sin_addr,
1035 sizeof(server.sin_addr), AF_INET,
1036 &result, hbuf, HOSTENT_BUFFER_SIZE, &thd_err);
1037 #elif defined(HAVE_GETHOSTBYADDR_R_5_ARGS)
1038 if (0 == gethostbyaddr_r((const char *)&server.sin_addr,
1039 sizeof(server.sin_addr), AF_INET,
1048 #elif defined(MUTEX_LOCKS_AVAILABLE)
1049 privoxy_mutex_lock(&resolver_mutex);
1050 host = gethostbyaddr((const char *)&server.sin_addr,
1051 sizeof(server.sin_addr), AF_INET);
1052 privoxy_mutex_unlock(&resolver_mutex);
1054 host = gethostbyaddr((const char *)&server.sin_addr,
1055 sizeof(server.sin_addr), AF_INET);
1059 log_error(LOG_LEVEL_ERROR, "Unable to get my own hostname: %E\n");
1063 *hostname = strdup(host->h_name);
1065 #endif /* else def HAVE_RFC2553 */
1072 /*********************************************************************
1074 * Function : accept_connection
1076 * Description : Accepts a connection on a socket. Socket must have
1077 * been created using bind_port().
1080 * 1 : csp = Client state, cfd, ip_addr_str, and
1081 * ip_addr_long will be set by this routine.
1082 * 2 : fd = file descriptor returned from bind_port
1084 * Returns : when a connection is accepted, it returns 1 (TRUE).
1085 * On an error it returns 0 (FALSE).
1087 *********************************************************************/
1088 int accept_connection(struct client_state * csp, jb_socket fd)
1091 /* XXX: client is stored directly into csp->tcp_addr */
1092 #define client (csp->tcp_addr)
1095 struct sockaddr_in client;
1098 #if defined(_WIN32) || defined(__OS2__) || defined(__APPLE_CC__) || defined(AMIGA)
1099 /* Wierdness - fix a warning. */
1105 c_length = sizeof(client);
1108 afd = accept (fd, (struct sockaddr *) &client, &c_length);
1109 if (afd == JB_INVALID_SOCKET)
1116 #if defined(FEATURE_ACCEPT_FILTER) && defined(SO_ACCEPTFILTER)
1117 struct accept_filter_arg af_options;
1118 bzero(&af_options, sizeof(af_options));
1119 strlcpy(af_options.af_name, "httpready", sizeof(af_options.af_name));
1120 setsockopt(fd, SOL_SOCKET, SO_ACCEPTFILTER, &af_options, sizeof(af_options));
1122 afd = accept (fd, (struct sockaddr *) &client, &c_length);
1123 } while (afd < 1 && errno == EINTR);
1132 csp->ip_addr_str = malloc(NI_MAXHOST);
1133 if (NULL == csp->ip_addr_str)
1135 log_error(LOG_LEVEL_ERROR,
1136 "Out of memory while getting the client's IP address.");
1139 retval = getnameinfo((struct sockaddr *) &client, c_length,
1140 csp->ip_addr_str, NI_MAXHOST, NULL, 0, NI_NUMERICHOST);
1141 if (!csp->ip_addr_str || retval)
1143 log_error(LOG_LEVEL_ERROR, "Can not save csp->ip_addr_str: %s",
1144 (csp->ip_addr_str) ? gai_strerror(retval) : "Insuffcient memory");
1145 freez(csp->ip_addr_str);
1149 csp->ip_addr_str = strdup(inet_ntoa(client.sin_addr));
1150 csp->ip_addr_long = ntohl(client.sin_addr.s_addr);
1151 #endif /* def HAVE_RFC2553 */
1158 /*********************************************************************
1160 * Function : resolve_hostname_to_ip
1162 * Description : Resolve a hostname to an internet tcp/ip address.
1163 * NULL or an empty string resolve to INADDR_ANY.
1166 * 1 : host = hostname to resolve
1168 * Returns : INADDR_NONE => failure, INADDR_ANY or tcp/ip address if successful.
1170 *********************************************************************/
1171 unsigned long resolve_hostname_to_ip(const char *host)
1173 struct sockaddr_in inaddr;
1174 struct hostent *hostp;
1175 #if defined(HAVE_GETHOSTBYNAME_R_6_ARGS) || defined(HAVE_GETHOSTBYNAME_R_5_ARGS) || defined(HAVE_GETHOSTBYNAME_R_3_ARGS)
1176 struct hostent result;
1177 #if defined(HAVE_GETHOSTBYNAME_R_6_ARGS) || defined(HAVE_GETHOSTBYNAME_R_5_ARGS)
1178 char hbuf[HOSTENT_BUFFER_SIZE];
1180 #else /* defined(HAVE_GETHOSTBYNAME_R_3_ARGS) */
1181 struct hostent_data hdata;
1182 #endif /* def HAVE_GETHOSTBYNAME_R_(6|5)_ARGS */
1183 #endif /* def HAVE_GETHOSTBYNAME_R_(6|5|3)_ARGS */
1185 if ((host == NULL) || (*host == '\0'))
1190 memset((char *) &inaddr, 0, sizeof inaddr);
1192 if ((inaddr.sin_addr.s_addr = inet_addr(host)) == -1)
1194 unsigned int dns_retries = 0;
1195 #if defined(HAVE_GETHOSTBYNAME_R_6_ARGS)
1196 while (gethostbyname_r(host, &result, hbuf,
1197 HOSTENT_BUFFER_SIZE, &hostp, &thd_err)
1198 && (thd_err == TRY_AGAIN) && (dns_retries++ < MAX_DNS_RETRIES))
1200 log_error(LOG_LEVEL_ERROR,
1201 "Timeout #%u while trying to resolve %s. Trying again.",
1204 #elif defined(HAVE_GETHOSTBYNAME_R_5_ARGS)
1205 while (NULL == (hostp = gethostbyname_r(host, &result,
1206 hbuf, HOSTENT_BUFFER_SIZE, &thd_err))
1207 && (thd_err == TRY_AGAIN) && (dns_retries++ < MAX_DNS_RETRIES))
1209 log_error(LOG_LEVEL_ERROR,
1210 "Timeout #%u while trying to resolve %s. Trying again.",
1213 #elif defined(HAVE_GETHOSTBYNAME_R_3_ARGS)
1215 * XXX: Doesn't retry in case of soft errors.
1216 * Does this gethostbyname_r version set h_errno?
1218 if (0 == gethostbyname_r(host, &result, &hdata))
1226 #elif defined(MUTEX_LOCKS_AVAILABLE)
1227 privoxy_mutex_lock(&resolver_mutex);
1228 while (NULL == (hostp = gethostbyname(host))
1229 && (h_errno == TRY_AGAIN) && (dns_retries++ < MAX_DNS_RETRIES))
1231 log_error(LOG_LEVEL_ERROR,
1232 "Timeout #%u while trying to resolve %s. Trying again.",
1235 privoxy_mutex_unlock(&resolver_mutex);
1237 while (NULL == (hostp = gethostbyname(host))
1238 && (h_errno == TRY_AGAIN) && (dns_retries++ < MAX_DNS_RETRIES))
1240 log_error(LOG_LEVEL_ERROR,
1241 "Timeout #%u while trying to resolve %s. Trying again.",
1244 #endif /* def HAVE_GETHOSTBYNAME_R_(6|5|3)_ARGS */
1246 * On Mac OSX, if a domain exists but doesn't have a type A
1247 * record associated with it, the h_addr member of the struct
1248 * hostent returned by gethostbyname is NULL, even if h_length
1249 * is 4. Therefore the second test below.
1251 if (hostp == NULL || hostp->h_addr == NULL)
1254 log_error(LOG_LEVEL_ERROR, "could not resolve hostname %s", host);
1255 return(INADDR_NONE);
1257 if (hostp->h_addrtype != AF_INET)
1260 errno = WSAEPROTOTYPE;
1264 log_error(LOG_LEVEL_ERROR, "hostname %s resolves to unknown address type.", host);
1265 return(INADDR_NONE);
1268 (char *) &inaddr.sin_addr,
1269 (char *) hostp->h_addr,
1270 sizeof(inaddr.sin_addr)
1273 return(inaddr.sin_addr.s_addr);
1278 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
1279 /*********************************************************************
1281 * Function : socket_is_still_alive
1283 * Description : Figures out whether or not a socket is still alive.
1286 * 1 : sfd = The socket to check.
1288 * Returns : TRUE for yes, otherwise FALSE.
1290 *********************************************************************/
1291 int socket_is_still_alive(jb_socket sfd)
1294 int no_data_waiting;
1298 struct pollfd poll_fd[1];
1300 memset(poll_fd, 0, sizeof(poll_fd));
1301 poll_fd[0].fd = sfd;
1302 poll_fd[0].events = POLLIN;
1304 poll_result = poll(poll_fd, 1, 0);
1306 if (-1 == poll_result)
1308 log_error(LOG_LEVEL_CONNECT, "Polling socket %d failed.", sfd);
1311 no_data_waiting = !(poll_fd[0].revents & POLLIN);
1313 fd_set readable_fds;
1314 struct timeval timeout;
1317 memset(&timeout, '\0', sizeof(timeout));
1318 FD_ZERO(&readable_fds);
1319 FD_SET(sfd, &readable_fds);
1321 ret = select((int)sfd+1, &readable_fds, NULL, NULL, &timeout);
1324 log_error(LOG_LEVEL_CONNECT, "select() on socket %d failed: %E", sfd);
1327 no_data_waiting = !FD_ISSET(sfd, &readable_fds);
1328 #endif /* def HAVE_POLL */
1330 return (no_data_waiting || (1 == recv(sfd, buf, 1, MSG_PEEK)));
1332 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */