1 const char jbsockets_rcs[] = "$Id: jbsockets.c,v 1.78 2010/07/26 11:28:11 fabiankeil Exp $";
2 /*********************************************************************
4 * File : $Source: /cvsroot/ijbswa/current/jbsockets.c,v $
6 * Purpose : Contains wrappers for system-specific sockets code,
7 * so that the rest of Junkbuster can be more
8 * OS-independent. Contains #ifdefs to make this work
11 * Copyright : Written by and Copyright (C) 2001-2010 the
12 * Privoxy team. http://www.privoxy.org/
14 * Based on the Internet Junkbuster originally written
15 * by and Copyright (C) 1997 Anonymous Coders and
16 * Junkbusters Corporation. http://www.junkbusters.com
18 * This program is free software; you can redistribute it
19 * and/or modify it under the terms of the GNU General
20 * Public License as published by the Free Software
21 * Foundation; either version 2 of the License, or (at
22 * your option) any later version.
24 * This program is distributed in the hope that it will
25 * be useful, but WITHOUT ANY WARRANTY; without even the
26 * implied warranty of MERCHANTABILITY or FITNESS FOR A
27 * PARTICULAR PURPOSE. See the GNU General Public
28 * License for more details.
30 * The GNU General Public License should be included with
31 * this file. If not, you can view it at
32 * http://www.gnu.org/copyleft/gpl.html
33 * or write to the Free Software Foundation, Inc., 59
34 * Temple Place - Suite 330, Boston, MA 02111-1307, USA.
36 *********************************************************************/
46 #include <sys/types.h>
54 #include <sys/timeb.h>
63 #include <netinet/in.h>
64 #include <sys/ioctl.h>
66 #include <sys/socket.h>
69 #include <netinet/tcp.h>
71 #include <arpa/inet.h>
77 #if defined(__EMX__) || defined (__OS2__)
78 #include <sys/select.h> /* OS/2/EMX needs a little help with select */
86 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
92 #endif /* def __GLIBC__ */
93 #endif /* HAVE_POLL */
94 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
98 /* For mutex semaphores only */
101 #include "jbsockets.h"
105 /* Mac OSX doesn't define AI_NUMERICSESRV */
106 #ifndef AI_NUMERICSERV
107 #define AI_NUMERICSERV 0
110 const char jbsockets_h_rcs[] = JBSOCKETS_H_VERSION;
113 * Maximum number of gethostbyname(_r) retries in case of
114 * soft errors (TRY_AGAIN).
115 * XXX: Does it make sense to make this a config option?
117 #define MAX_DNS_RETRIES 10
119 #define MAX_LISTEN_BACKLOG 128
122 /*********************************************************************
124 * Function : connect_to
126 * Description : Open a socket and connect to it. Will check
127 * that this is allowed according to ACL.
130 * 1 : host = hostname to connect to
131 * 2 : portnum = port to connent on (XXX: should be unsigned)
132 * 3 : csp = Current client state (buffers, headers, etc...)
133 * Not modified, only used for source IP and ACL.
135 * Returns : JB_INVALID_SOCKET => failure, else it is the socket
138 *********************************************************************/
140 /* Getaddrinfo implementation */
141 jb_socket connect_to(const char *host, int portnum, struct client_state *csp)
143 struct addrinfo hints, *result, *rp;
148 struct timeval tv[1];
149 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
155 struct access_control_addr dst[1];
156 #endif /* def FEATURE_ACL */
158 retval = snprintf(service, sizeof(service), "%d", portnum);
159 if ((-1 == retval) || (sizeof(service) <= retval))
161 log_error(LOG_LEVEL_ERROR,
162 "Port number (%d) ASCII decimal representation doesn't fit into 6 bytes",
164 csp->http->host_ip_addr_str = strdup("unknown");
165 return(JB_INVALID_SOCKET);
168 memset((char *)&hints, 0, sizeof(hints));
169 hints.ai_family = AF_UNSPEC;
170 hints.ai_socktype = SOCK_STREAM;
171 hints.ai_flags = AI_NUMERICSERV; /* avoid service look-up */
173 hints.ai_flags |= AI_ADDRCONFIG;
175 if ((retval = getaddrinfo(host, service, &hints, &result)))
177 log_error(LOG_LEVEL_INFO,
178 "Can not resolve %s: %s", host, gai_strerror(retval));
179 /* XXX: Should find a better way to propagate this error. */
181 csp->http->host_ip_addr_str = strdup("unknown");
182 return(JB_INVALID_SOCKET);
185 for (rp = result; rp != NULL; rp = rp->ai_next)
189 memcpy(&dst->addr, rp->ai_addr, rp->ai_addrlen);
191 if (block_acl(dst, csp))
200 #endif /* def FEATURE_ACL */
202 csp->http->host_ip_addr_str = malloc(NI_MAXHOST);
203 if (NULL == csp->http->host_ip_addr_str)
205 log_error(LOG_LEVEL_ERROR,
206 "Out of memory while getting the server IP address.");
207 return JB_INVALID_SOCKET;
209 retval = getnameinfo(rp->ai_addr, rp->ai_addrlen,
210 csp->http->host_ip_addr_str, NI_MAXHOST, NULL, 0, NI_NUMERICHOST);
211 if (!csp->http->host_ip_addr_str || retval)
213 log_error(LOG_LEVEL_ERROR,
214 "Can not save csp->http->host_ip_addr_str: %s",
215 (csp->http->host_ip_addr_str) ?
216 gai_strerror(retval) : "Insufficient memory");
217 freez(csp->http->host_ip_addr_str);
222 if ((fd = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol)) ==
225 if ((fd = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol)) < 0)
232 { /* turn off TCP coalescence */
234 setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, (char *) &mi, sizeof (int));
236 #endif /* def TCP_NODELAY */
238 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
239 if ((flags = fcntl(fd, F_GETFL, 0)) != -1)
242 fcntl(fd, F_SETFL, flags);
244 #endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__) */
247 while (connect(fd, rp->ai_addr, rp->ai_addrlen) == JB_INVALID_SOCKET)
250 if (errno == WSAEINPROGRESS)
252 if (sock_errno() == EINPROGRESS)
253 #else /* ifndef _WIN32 */
254 if (errno == EINPROGRESS)
255 #endif /* ndef _WIN32 || __OS2__ */
261 if (sock_errno() != EINTR)
276 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
280 fcntl(fd, F_SETFL, flags);
282 #endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__) */
284 /* wait for connection to complete */
291 /* MS Windows uses int, not SOCKET, for the 1st arg of select(). Wierd! */
292 if ((select((int)fd + 1, NULL, &wfds, NULL, tv) > 0)
293 && FD_ISSET(fd, &wfds))
296 * See Linux connect(2) man page for more info
297 * about connecting on non-blocking socket.
300 socklen_t optlen = sizeof(socket_in_error);
301 if (!getsockopt(fd, SOL_SOCKET, SO_ERROR, &socket_in_error, &optlen))
303 if (!socket_in_error)
305 /* Connection established, no need to try other addresses. */
308 log_error(LOG_LEVEL_CONNECT, "Could not connect to [%s]:%s: %s.",
309 csp->http->host_ip_addr_str, service, strerror(socket_in_error));
313 log_error(LOG_LEVEL_ERROR, "Could not get the state of "
314 "the connection to [%s]:%s: %s; dropping connection.",
315 csp->http->host_ip_addr_str, service, strerror(errno));
319 /* Connection failed, try next address */
323 freeaddrinfo(result);
326 log_error(LOG_LEVEL_CONNECT, "Could not connect to [%s]:%s.",
328 return(JB_INVALID_SOCKET);
330 log_error(LOG_LEVEL_CONNECT, "Connected to %s[%s]:%s.",
331 host, csp->http->host_ip_addr_str, service);
337 #else /* ndef HAVE_RFC2553 */
338 /* Pre-getaddrinfo implementation */
340 jb_socket connect_to(const char *host, int portnum, struct client_state *csp)
342 struct sockaddr_in inaddr;
346 struct timeval tv[1];
347 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
352 struct access_control_addr dst[1];
353 #endif /* def FEATURE_ACL */
355 memset((char *)&inaddr, 0, sizeof inaddr);
357 if ((addr = resolve_hostname_to_ip(host)) == INADDR_NONE)
359 csp->http->host_ip_addr_str = strdup("unknown");
360 return(JB_INVALID_SOCKET);
364 dst->addr = ntohl(addr);
367 if (block_acl(dst, csp))
374 return(JB_INVALID_SOCKET);
376 #endif /* def FEATURE_ACL */
378 inaddr.sin_addr.s_addr = addr;
379 inaddr.sin_family = AF_INET;
380 csp->http->host_ip_addr_str = strdup(inet_ntoa(inaddr.sin_addr));
383 if (sizeof(inaddr.sin_port) == sizeof(short))
384 #endif /* ndef _WIN32 */
386 inaddr.sin_port = htons((unsigned short) portnum);
391 inaddr.sin_port = htonl((unsigned long)portnum);
393 #endif /* ndef _WIN32 */
396 if ((fd = socket(inaddr.sin_family, SOCK_STREAM, 0)) == JB_INVALID_SOCKET)
398 if ((fd = socket(inaddr.sin_family, SOCK_STREAM, 0)) < 0)
401 return(JB_INVALID_SOCKET);
405 { /* turn off TCP coalescence */
407 setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, (char *) &mi, sizeof (int));
409 #endif /* def TCP_NODELAY */
411 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
412 if ((flags = fcntl(fd, F_GETFL, 0)) != -1)
415 fcntl(fd, F_SETFL, flags);
417 #endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__) */
419 while (connect(fd, (struct sockaddr *) & inaddr, sizeof inaddr) == JB_INVALID_SOCKET)
422 if (errno == WSAEINPROGRESS)
424 if (sock_errno() == EINPROGRESS)
425 #else /* ifndef _WIN32 */
426 if (errno == EINPROGRESS)
427 #endif /* ndef _WIN32 || __OS2__ */
433 if (sock_errno() != EINTR)
439 return(JB_INVALID_SOCKET);
443 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
447 fcntl(fd, F_SETFL, flags);
449 #endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__) */
451 /* wait for connection to complete */
458 /* MS Windows uses int, not SOCKET, for the 1st arg of select(). Wierd! */
459 if (select((int)fd + 1, NULL, &wfds, NULL, tv) <= 0)
462 return(JB_INVALID_SOCKET);
467 #endif /* ndef HAVE_RFC2553 */
470 /*********************************************************************
472 * Function : write_socket
474 * Description : Write the contents of buf (for n bytes) to socket fd.
477 * 1 : fd = file descriptor (aka. handle) of socket to write to.
478 * 2 : buf = pointer to data to be written.
479 * 3 : len = length of data to be written to the socket "fd".
481 * Returns : 0 on success (entire buffer sent).
484 *********************************************************************/
486 int write_socket(jb_socket fd, const char *buf, ssize_t len)
488 int write_socket(jb_socket fd, const char *buf, size_t len)
496 if (len < 0) /* constant condition - size_t isn't ever negative */
501 log_error(LOG_LEVEL_WRITING, "to socket %d: %N", fd, len, buf);
504 return (send(fd, buf, (int)len, 0) != (int)len);
505 #elif defined(__BEOS__) || defined(AMIGA)
506 return (send(fd, buf, len, 0) != len);
507 #elif defined(__OS2__)
509 * Break the data up into SOCKET_SEND_MAX chunks for sending...
510 * OS/2 seemed to complain when the chunks were too large.
512 #define SOCKET_SEND_MAX 65000
514 int send_len, send_rc = 0, i = 0;
515 while ((i < len) && (send_rc != -1))
517 if ((i + SOCKET_SEND_MAX) > len)
520 send_len = SOCKET_SEND_MAX;
521 send_rc = send(fd,(char*)buf + i, send_len, 0);
529 return (write(fd, buf, len) != len);
535 /*********************************************************************
537 * Function : read_socket
539 * Description : Read from a TCP/IP socket in a platform independent way.
542 * 1 : fd = file descriptor of the socket to read
543 * 2 : buf = pointer to buffer where data will be written
544 * Must be >= len bytes long.
545 * 3 : len = maximum number of bytes to read
547 * Returns : On success, the number of bytes read is returned (zero
548 * indicates end of file), and the file position is advanced
549 * by this number. It is not an error if this number is
550 * smaller than the number of bytes requested; this may hap-
551 * pen for example because fewer bytes are actually available
552 * right now (maybe because we were close to end-of-file, or
553 * because we are reading from a pipe, or from a terminal,
554 * or because read() was interrupted by a signal). On error,
555 * -1 is returned, and errno is set appropriately. In this
556 * case it is left unspecified whether the file position (if
559 *********************************************************************/
560 int read_socket(jb_socket fd, char *buf, int len)
570 ret = recv(fd, buf, len, 0);
571 #elif defined(__BEOS__) || defined(AMIGA) || defined(__OS2__)
572 ret = recv(fd, buf, (size_t)len, 0);
574 ret = (int)read(fd, buf, (size_t)len);
579 log_error(LOG_LEVEL_RECEIVED, "from socket %d: %N", fd, ret, buf);
586 /*********************************************************************
588 * Function : data_is_available
590 * Description : Waits for data to arrive on a socket.
593 * 1 : fd = file descriptor of the socket to read
594 * 2 : seconds_to_wait = number of seconds after which we give up.
596 * Returns : TRUE if data arrived in time,
599 *********************************************************************/
600 int data_is_available(jb_socket fd, int seconds_to_wait)
604 struct timeval timeout;
607 memset(&timeout, 0, sizeof(timeout));
608 timeout.tv_sec = seconds_to_wait;
611 /* Copy and pasted from jcc.c ... */
612 memset(&rfds, 0, sizeof(fd_set));
618 n = select(fd+1, &rfds, NULL, NULL, &timeout);
621 * XXX: Do we care about the different error conditions?
623 return ((n == 1) && (1 == recv(fd, buf, 1, MSG_PEEK)));
627 /*********************************************************************
629 * Function : close_socket
631 * Description : Closes a TCP/IP socket
634 * 1 : fd = file descriptor of socket to be closed
638 *********************************************************************/
639 void close_socket(jb_socket fd)
641 #if defined(_WIN32) || defined(__BEOS__)
645 #elif defined(__OS2__)
654 /*********************************************************************
656 * Function : bind_port
658 * Description : Call socket, set socket options, and listen.
659 * Called by listen_loop to "boot up" our proxy address.
662 * 1 : hostnam = TCP/IP address to bind/listen to
663 * 2 : portnum = port to listen on
664 * 3 : pfd = pointer used to return file descriptor.
666 * Returns : if success, returns 0 and sets *pfd.
667 * if failure, returns -3 if address is in use,
668 * -2 if address unresolvable,
670 *********************************************************************/
671 int bind_port(const char *hostnam, int portnum, jb_socket *pfd)
674 struct addrinfo hints;
675 struct addrinfo *result, *rp;
677 * XXX: portnum should be a string to allow symbolic service
678 * names in the configuration file and to avoid the following
684 struct sockaddr_in inaddr;
685 #endif /* def HAVE_RFC2553 */
689 #endif /* ndef _WIN32 */
691 *pfd = JB_INVALID_SOCKET;
694 retval = snprintf(servnam, sizeof(servnam), "%d", portnum);
695 if ((-1 == retval) || (sizeof(servnam) <= retval))
697 log_error(LOG_LEVEL_ERROR,
698 "Port number (%d) ASCII decimal representation doesn't fit into 6 bytes",
703 memset(&hints, 0, sizeof(struct addrinfo));
707 * XXX: This is a hack. The right thing to do
708 * would be to bind to both AF_INET and AF_INET6.
709 * This will also fail if there is no AF_INET
712 hints.ai_family = AF_INET;
716 hints.ai_family = AF_UNSPEC;
718 hints.ai_socktype = SOCK_STREAM;
719 hints.ai_flags = AI_PASSIVE;
721 hints.ai_flags |= AI_ADDRCONFIG;
723 hints.ai_protocol = 0; /* Realy any stream protocol or TCP only */
724 hints.ai_canonname = NULL;
725 hints.ai_addr = NULL;
726 hints.ai_next = NULL;
728 if ((retval = getaddrinfo(hostnam, servnam, &hints, &result)))
730 log_error(LOG_LEVEL_ERROR,
731 "Can not resolve %s: %s", hostnam, gai_strerror(retval));
735 memset((char *)&inaddr, '\0', sizeof inaddr);
737 inaddr.sin_family = AF_INET;
738 inaddr.sin_addr.s_addr = resolve_hostname_to_ip(hostnam);
740 if (inaddr.sin_addr.s_addr == INADDR_NONE)
746 if (sizeof(inaddr.sin_port) == sizeof(short))
747 #endif /* ndef _WIN32 */
749 inaddr.sin_port = htons((unsigned short) portnum);
754 inaddr.sin_port = htonl((unsigned long) portnum);
756 #endif /* ndef _WIN32 */
757 #endif /* def HAVE_RFC2553 */
760 for (rp = result; rp != NULL; rp = rp->ai_next)
762 fd = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol);
764 fd = socket(AF_INET, SOCK_STREAM, 0);
765 #endif /* def HAVE_RFC2553 */
768 if (fd == JB_INVALID_SOCKET)
782 * This is not needed for Win32 - in fact, it stops
783 * duplicate instances of Privoxy from being caught.
785 * On UNIX, we assume the user is sensible enough not
786 * to start Privoxy multiple times on the same IP.
787 * Without this, stopping and restarting Privoxy
788 * from a script fails.
789 * Note: SO_REUSEADDR is meant to only take over
790 * sockets which are *not* in listen state in Linux,
791 * e.g. sockets in TIME_WAIT. YMMV.
793 setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char *)&one, sizeof(one));
794 #endif /* ndef _WIN32 */
797 if (bind(fd, rp->ai_addr, rp->ai_addrlen) < 0)
799 if (bind(fd, (struct sockaddr *)&inaddr, sizeof(inaddr)) < 0)
803 errno = WSAGetLastError();
804 if (errno == WSAEADDRINUSE)
806 if (errno == EADDRINUSE)
810 freeaddrinfo(result);
827 /* bind() succeeded, escape from for-loop */
829 * XXX: Support multiple listening sockets (e.g. localhost
830 * resolves to AF_INET and AF_INET6, but only the first address
837 freeaddrinfo(result);
840 /* All bind()s failed */
843 #endif /* ndef HAVE_RFC2553 */
845 while (listen(fd, MAX_LISTEN_BACKLOG) == -1)
859 /*********************************************************************
861 * Function : get_host_information
863 * Description : Determines the IP address the client used to
864 * reach us and the hostname associated with it.
866 * XXX: Most of the code has been copy and pasted
867 * from accept_connection() and not all of the
868 * ifdefs paths have been tested afterwards.
871 * 1 : afd = File descriptor returned from accept().
872 * 2 : ip_address = Pointer to return the pointer to
873 * the ip address string.
874 * 3 : hostname = Pointer to return the pointer to
875 * the hostname or NULL if the caller
876 * isn't interested in it.
880 *********************************************************************/
881 void get_host_information(jb_socket afd, char **ip_address, char **hostname)
884 struct sockaddr_storage server;
887 struct sockaddr_in server;
888 struct hostent *host = NULL;
889 #endif /* HAVE_RFC2553 */
890 #if defined(_WIN32) || defined(__OS2__) || defined(__APPLE_CC__) || defined(AMIGA)
891 /* according to accept_connection() this fixes a warning. */
892 int s_length, s_length_provided;
894 socklen_t s_length, s_length_provided;
897 #if defined(HAVE_GETHOSTBYADDR_R_8_ARGS) || defined(HAVE_GETHOSTBYADDR_R_7_ARGS) || defined(HAVE_GETHOSTBYADDR_R_5_ARGS)
898 struct hostent result;
899 #if defined(HAVE_GETHOSTBYADDR_R_5_ARGS)
900 struct hostent_data hdata;
902 char hbuf[HOSTENT_BUFFER_SIZE];
904 #endif /* def HAVE_GETHOSTBYADDR_R_5_ARGS */
905 #endif /* def HAVE_GETHOSTBYADDR_R_(8|7|5)_ARGS */
906 #endif /* ifndef HAVE_RFC2553 */
907 s_length = s_length_provided = sizeof(server);
909 if (NULL != hostname)
915 if (!getsockname(afd, (struct sockaddr *) &server, &s_length))
917 if (s_length > s_length_provided)
919 log_error(LOG_LEVEL_ERROR, "getsockname() truncated server address");
923 *ip_address = malloc(NI_MAXHOST);
924 if (NULL == *ip_address)
926 log_error(LOG_LEVEL_ERROR,
927 "Out of memory while getting the client's IP address.");
930 retval = getnameinfo((struct sockaddr *) &server, s_length,
931 *ip_address, NI_MAXHOST, NULL, 0, NI_NUMERICHOST);
934 log_error(LOG_LEVEL_ERROR,
935 "Unable to print my own IP address: %s", gai_strerror(retval));
940 *ip_address = strdup(inet_ntoa(server.sin_addr));
941 #endif /* HAVE_RFC2553 */
942 if (NULL == hostname)
945 * We're done here, the caller isn't
946 * interested in knowing the hostname.
952 *hostname = malloc(NI_MAXHOST);
953 if (NULL == *hostname)
955 log_error(LOG_LEVEL_ERROR,
956 "Out of memory while getting the client's hostname.");
959 retval = getnameinfo((struct sockaddr *) &server, s_length,
960 *hostname, NI_MAXHOST, NULL, 0, NI_NAMEREQD);
963 log_error(LOG_LEVEL_ERROR,
964 "Unable to resolve my own IP address: %s", gai_strerror(retval));
968 #if defined(HAVE_GETHOSTBYADDR_R_8_ARGS)
969 gethostbyaddr_r((const char *)&server.sin_addr,
970 sizeof(server.sin_addr), AF_INET,
971 &result, hbuf, HOSTENT_BUFFER_SIZE,
973 #elif defined(HAVE_GETHOSTBYADDR_R_7_ARGS)
974 host = gethostbyaddr_r((const char *)&server.sin_addr,
975 sizeof(server.sin_addr), AF_INET,
976 &result, hbuf, HOSTENT_BUFFER_SIZE, &thd_err);
977 #elif defined(HAVE_GETHOSTBYADDR_R_5_ARGS)
978 if (0 == gethostbyaddr_r((const char *)&server.sin_addr,
979 sizeof(server.sin_addr), AF_INET,
988 #elif defined(MUTEX_LOCKS_AVAILABLE)
989 privoxy_mutex_lock(&resolver_mutex);
990 host = gethostbyaddr((const char *)&server.sin_addr,
991 sizeof(server.sin_addr), AF_INET);
992 privoxy_mutex_unlock(&resolver_mutex);
994 host = gethostbyaddr((const char *)&server.sin_addr,
995 sizeof(server.sin_addr), AF_INET);
999 log_error(LOG_LEVEL_ERROR, "Unable to get my own hostname: %E\n");
1003 *hostname = strdup(host->h_name);
1005 #endif /* else def HAVE_RFC2553 */
1012 /*********************************************************************
1014 * Function : accept_connection
1016 * Description : Accepts a connection on a socket. Socket must have
1017 * been created using bind_port().
1020 * 1 : csp = Client state, cfd, ip_addr_str, and
1021 * ip_addr_long will be set by this routine.
1022 * 2 : fd = file descriptor returned from bind_port
1024 * Returns : when a connection is accepted, it returns 1 (TRUE).
1025 * On an error it returns 0 (FALSE).
1027 *********************************************************************/
1028 int accept_connection(struct client_state * csp, jb_socket fd)
1031 /* XXX: client is stored directly into csp->tcp_addr */
1032 #define client (csp->tcp_addr)
1035 struct sockaddr_in client;
1038 #if defined(_WIN32) || defined(__OS2__) || defined(__APPLE_CC__) || defined(AMIGA)
1039 /* Wierdness - fix a warning. */
1045 c_length = sizeof(client);
1048 afd = accept (fd, (struct sockaddr *) &client, &c_length);
1049 if (afd == JB_INVALID_SOCKET)
1056 #if defined(FEATURE_ACCEPT_FILTER) && defined(SO_ACCEPTFILTER)
1057 struct accept_filter_arg af_options;
1058 bzero(&af_options, sizeof(af_options));
1059 strlcpy(af_options.af_name, "httpready", sizeof(af_options.af_name));
1060 setsockopt(fd, SOL_SOCKET, SO_ACCEPTFILTER, &af_options, sizeof(af_options));
1062 afd = accept (fd, (struct sockaddr *) &client, &c_length);
1063 } while (afd < 1 && errno == EINTR);
1072 csp->ip_addr_str = malloc(NI_MAXHOST);
1073 if (NULL == csp->ip_addr_str)
1075 log_error(LOG_LEVEL_ERROR,
1076 "Out of memory while getting the client's IP address.");
1079 retval = getnameinfo((struct sockaddr *) &client, c_length,
1080 csp->ip_addr_str, NI_MAXHOST, NULL, 0, NI_NUMERICHOST);
1081 if (!csp->ip_addr_str || retval)
1083 log_error(LOG_LEVEL_ERROR, "Can not save csp->ip_addr_str: %s",
1084 (csp->ip_addr_str) ? gai_strerror(retval) : "Insuffcient memory");
1085 freez(csp->ip_addr_str);
1089 csp->ip_addr_str = strdup(inet_ntoa(client.sin_addr));
1090 csp->ip_addr_long = ntohl(client.sin_addr.s_addr);
1091 #endif /* def HAVE_RFC2553 */
1098 /*********************************************************************
1100 * Function : resolve_hostname_to_ip
1102 * Description : Resolve a hostname to an internet tcp/ip address.
1103 * NULL or an empty string resolve to INADDR_ANY.
1106 * 1 : host = hostname to resolve
1108 * Returns : INADDR_NONE => failure, INADDR_ANY or tcp/ip address if succesful.
1110 *********************************************************************/
1111 unsigned long resolve_hostname_to_ip(const char *host)
1113 struct sockaddr_in inaddr;
1114 struct hostent *hostp;
1115 #if defined(HAVE_GETHOSTBYNAME_R_6_ARGS) || defined(HAVE_GETHOSTBYNAME_R_5_ARGS) || defined(HAVE_GETHOSTBYNAME_R_3_ARGS)
1116 struct hostent result;
1117 #if defined(HAVE_GETHOSTBYNAME_R_6_ARGS) || defined(HAVE_GETHOSTBYNAME_R_5_ARGS)
1118 char hbuf[HOSTENT_BUFFER_SIZE];
1120 #else /* defined(HAVE_GETHOSTBYNAME_R_3_ARGS) */
1121 struct hostent_data hdata;
1122 #endif /* def HAVE_GETHOSTBYNAME_R_(6|5)_ARGS */
1123 #endif /* def HAVE_GETHOSTBYNAME_R_(6|5|3)_ARGS */
1125 if ((host == NULL) || (*host == '\0'))
1130 memset((char *) &inaddr, 0, sizeof inaddr);
1132 if ((inaddr.sin_addr.s_addr = inet_addr(host)) == -1)
1134 unsigned int dns_retries = 0;
1135 #if defined(HAVE_GETHOSTBYNAME_R_6_ARGS)
1136 while (gethostbyname_r(host, &result, hbuf,
1137 HOSTENT_BUFFER_SIZE, &hostp, &thd_err)
1138 && (thd_err == TRY_AGAIN) && (dns_retries++ < MAX_DNS_RETRIES))
1140 log_error(LOG_LEVEL_ERROR,
1141 "Timeout #%u while trying to resolve %s. Trying again.",
1144 #elif defined(HAVE_GETHOSTBYNAME_R_5_ARGS)
1145 while (NULL == (hostp = gethostbyname_r(host, &result,
1146 hbuf, HOSTENT_BUFFER_SIZE, &thd_err))
1147 && (thd_err == TRY_AGAIN) && (dns_retries++ < MAX_DNS_RETRIES))
1149 log_error(LOG_LEVEL_ERROR,
1150 "Timeout #%u while trying to resolve %s. Trying again.",
1153 #elif defined(HAVE_GETHOSTBYNAME_R_3_ARGS)
1155 * XXX: Doesn't retry in case of soft errors.
1156 * Does this gethostbyname_r version set h_errno?
1158 if (0 == gethostbyname_r(host, &result, &hdata))
1166 #elif defined(MUTEX_LOCKS_AVAILABLE)
1167 privoxy_mutex_lock(&resolver_mutex);
1168 while (NULL == (hostp = gethostbyname(host))
1169 && (h_errno == TRY_AGAIN) && (dns_retries++ < MAX_DNS_RETRIES))
1171 log_error(LOG_LEVEL_ERROR,
1172 "Timeout #%u while trying to resolve %s. Trying again.",
1175 privoxy_mutex_unlock(&resolver_mutex);
1177 while (NULL == (hostp = gethostbyname(host))
1178 && (h_errno == TRY_AGAIN) && (dns_retries++ < MAX_DNS_RETRIES))
1180 log_error(LOG_LEVEL_ERROR,
1181 "Timeout #%u while trying to resolve %s. Trying again.",
1184 #endif /* def HAVE_GETHOSTBYNAME_R_(6|5|3)_ARGS */
1186 * On Mac OSX, if a domain exists but doesn't have a type A
1187 * record associated with it, the h_addr member of the struct
1188 * hostent returned by gethostbyname is NULL, even if h_length
1189 * is 4. Therefore the second test below.
1191 if (hostp == NULL || hostp->h_addr == NULL)
1194 log_error(LOG_LEVEL_ERROR, "could not resolve hostname %s", host);
1195 return(INADDR_NONE);
1197 if (hostp->h_addrtype != AF_INET)
1200 errno = WSAEPROTOTYPE;
1204 log_error(LOG_LEVEL_ERROR, "hostname %s resolves to unknown address type.", host);
1205 return(INADDR_NONE);
1208 (char *) &inaddr.sin_addr,
1209 (char *) hostp->h_addr,
1210 sizeof(inaddr.sin_addr)
1213 return(inaddr.sin_addr.s_addr);
1218 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
1219 /*********************************************************************
1221 * Function : socket_is_still_alive
1223 * Description : Figures out whether or not a socket is still alive.
1226 * 1 : sfd = The socket to check.
1228 * Returns : TRUE for yes, otherwise FALSE.
1230 *********************************************************************/
1231 int socket_is_still_alive(jb_socket sfd)
1234 int no_data_waiting;
1238 struct pollfd poll_fd[1];
1240 memset(poll_fd, 0, sizeof(poll_fd));
1241 poll_fd[0].fd = sfd;
1242 poll_fd[0].events = POLLIN;
1244 poll_result = poll(poll_fd, 1, 0);
1246 if (-1 == poll_result)
1248 log_error(LOG_LEVEL_CONNECT, "Polling socket %d failed.", sfd);
1251 no_data_waiting = !(poll_fd[0].revents & POLLIN);
1253 fd_set readable_fds;
1254 struct timeval timeout;
1257 memset(&timeout, '\0', sizeof(timeout));
1258 FD_ZERO(&readable_fds);
1259 FD_SET(sfd, &readable_fds);
1261 ret = select((int)sfd+1, &readable_fds, NULL, NULL, &timeout);
1264 log_error(LOG_LEVEL_CONNECT, "select() on socket %d failed: %E", sfd);
1267 no_data_waiting = !FD_ISSET(sfd, &readable_fds);
1268 #endif /* def HAVE_POLL */
1270 return (no_data_waiting || (1 == recv(sfd, buf, 1, MSG_PEEK)));
1272 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */