1 const char jbsockets_rcs[] = "$Id: jbsockets.c,v 1.97 2011/03/27 14:04:10 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->forward_host == NULL) && (csp->fwd->type == SOCKS_NONE)))
165 forwarded_connect_retries++;
166 log_error(LOG_LEVEL_ERROR,
167 "Attempt %d of %d to connect to %s failed. Trying again.",
168 forwarded_connect_retries, csp->config->forwarded_connect_retries, host);
170 } while (forwarded_connect_retries < csp->config->forwarded_connect_retries);
176 /* Getaddrinfo implementation */
177 static jb_socket rfc2553_connect_to(const char *host, int portnum, struct client_state *csp)
179 struct addrinfo hints, *result, *rp;
184 struct timeval timeout;
185 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
190 * XXX: Initializeing it here is only necessary
191 * because not all situations are properly
194 int socket_error = 0;
197 struct access_control_addr dst[1];
198 #endif /* def FEATURE_ACL */
200 /* Don't leak memory when retrying. */
201 freez(csp->error_message);
202 freez(csp->http->host_ip_addr_str);
204 retval = snprintf(service, sizeof(service), "%d", portnum);
205 if ((-1 == retval) || (sizeof(service) <= retval))
207 log_error(LOG_LEVEL_ERROR,
208 "Port number (%d) ASCII decimal representation doesn't fit into 6 bytes",
210 csp->error_message = strdup("Invalid port number");
211 csp->http->host_ip_addr_str = strdup("unknown");
212 return(JB_INVALID_SOCKET);
215 memset((char *)&hints, 0, sizeof(hints));
216 hints.ai_family = AF_UNSPEC;
217 hints.ai_socktype = SOCK_STREAM;
218 hints.ai_flags = AI_NUMERICSERV; /* avoid service look-up */
220 hints.ai_flags |= AI_ADDRCONFIG;
222 if ((retval = getaddrinfo(host, service, &hints, &result)))
224 log_error(LOG_LEVEL_INFO,
225 "Can not resolve %s: %s", host, gai_strerror(retval));
226 /* XXX: Should find a better way to propagate this error. */
228 csp->error_message = strdup(gai_strerror(retval));
229 csp->http->host_ip_addr_str = strdup("unknown");
230 return(JB_INVALID_SOCKET);
233 csp->http->host_ip_addr_str = malloc(NI_MAXHOST);
234 if (NULL == csp->http->host_ip_addr_str)
236 freeaddrinfo(result);
237 log_error(LOG_LEVEL_ERROR,
238 "Out of memory while getting the server IP address.");
239 return JB_INVALID_SOCKET;
242 for (rp = result; rp != NULL; rp = rp->ai_next)
246 memcpy(&dst->addr, rp->ai_addr, rp->ai_addrlen);
248 if (block_acl(dst, csp))
251 socket_error = errno = SOCEPERM;
253 socket_error = errno = EPERM;
257 #endif /* def FEATURE_ACL */
259 retval = getnameinfo(rp->ai_addr, rp->ai_addrlen,
260 csp->http->host_ip_addr_str, NI_MAXHOST, NULL, 0, NI_NUMERICHOST);
263 log_error(LOG_LEVEL_ERROR,
264 "Failed to get the host name from the socket structure: %s",
265 gai_strerror(retval));
269 fd = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol);
271 if (fd == JB_INVALID_SOCKET)
280 { /* turn off TCP coalescence */
282 setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, (char *) &mi, sizeof (int));
284 #endif /* def TCP_NODELAY */
286 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
287 if ((flags = fcntl(fd, F_GETFL, 0)) != -1)
290 fcntl(fd, F_SETFL, flags);
292 #endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__) */
295 while (connect(fd, rp->ai_addr, rp->ai_addrlen) == JB_INVALID_SOCKET)
298 errno = sock_errno();
302 if (errno == WSAEINPROGRESS)
303 #else /* ifndef _WIN32 */
304 if (errno == EINPROGRESS)
305 #endif /* ndef _WIN32 || __OS2__ */
322 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
326 fcntl(fd, F_SETFL, flags);
328 #endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__) */
330 /* wait for connection to complete */
334 memset(&timeout, 0, sizeof(timeout));
337 /* MS Windows uses int, not SOCKET, for the 1st arg of select(). Wierd! */
338 if ((select((int)fd + 1, NULL, &wfds, NULL, &timeout) > 0)
339 && FD_ISSET(fd, &wfds))
341 socklen_t optlen = sizeof(socket_error);
342 if (!getsockopt(fd, SOL_SOCKET, SO_ERROR, &socket_error, &optlen))
346 /* Connection established, no need to try other addresses. */
349 log_error(LOG_LEVEL_CONNECT, "Could not connect to [%s]:%s: %s.",
350 csp->http->host_ip_addr_str, service, strerror(socket_error));
354 socket_error = errno;
355 log_error(LOG_LEVEL_ERROR, "Could not get the state of "
356 "the connection to [%s]:%s: %s; dropping connection.",
357 csp->http->host_ip_addr_str, service, strerror(errno));
361 /* Connection failed, try next address */
365 freeaddrinfo(result);
368 log_error(LOG_LEVEL_CONNECT, "Could not connect to [%s]:%s: %s.",
369 host, service, strerror(socket_error));
370 csp->error_message = strdup(strerror(socket_error));
371 return(JB_INVALID_SOCKET);
373 log_error(LOG_LEVEL_CONNECT, "Connected to %s[%s]:%s.",
374 host, csp->http->host_ip_addr_str, service);
380 #else /* ndef HAVE_RFC2553 */
381 /* Pre-getaddrinfo implementation */
383 static jb_socket no_rfc2553_connect_to(const char *host, int portnum, struct client_state *csp)
385 struct sockaddr_in inaddr;
389 struct timeval tv[1];
390 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
395 struct access_control_addr dst[1];
396 #endif /* def FEATURE_ACL */
398 /* Don't leak memory when retrying. */
399 freez(csp->http->host_ip_addr_str);
401 memset((char *)&inaddr, 0, sizeof inaddr);
403 if ((addr = resolve_hostname_to_ip(host)) == INADDR_NONE)
405 csp->http->host_ip_addr_str = strdup("unknown");
406 return(JB_INVALID_SOCKET);
410 dst->addr = ntohl(addr);
413 if (block_acl(dst, csp))
420 return(JB_INVALID_SOCKET);
422 #endif /* def FEATURE_ACL */
424 inaddr.sin_addr.s_addr = addr;
425 inaddr.sin_family = AF_INET;
426 csp->http->host_ip_addr_str = strdup(inet_ntoa(inaddr.sin_addr));
429 if (sizeof(inaddr.sin_port) == sizeof(short))
430 #endif /* ndef _WIN32 */
432 inaddr.sin_port = htons((unsigned short) portnum);
437 inaddr.sin_port = htonl((unsigned long)portnum);
439 #endif /* ndef _WIN32 */
441 fd = socket(inaddr.sin_family, SOCK_STREAM, 0);
443 if (fd == JB_INVALID_SOCKET)
448 return(JB_INVALID_SOCKET);
452 { /* turn off TCP coalescence */
454 setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, (char *) &mi, sizeof (int));
456 #endif /* def TCP_NODELAY */
458 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
459 if ((flags = fcntl(fd, F_GETFL, 0)) != -1)
462 fcntl(fd, F_SETFL, flags);
464 #endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__) */
466 while (connect(fd, (struct sockaddr *) & inaddr, sizeof inaddr) == JB_INVALID_SOCKET)
469 if (errno == WSAEINPROGRESS)
471 if (sock_errno() == EINPROGRESS)
472 #else /* ifndef _WIN32 */
473 if (errno == EINPROGRESS)
474 #endif /* ndef _WIN32 || __OS2__ */
480 if (sock_errno() != EINTR)
486 return(JB_INVALID_SOCKET);
490 #if !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
494 fcntl(fd, F_SETFL, flags);
496 #endif /* !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__) */
498 /* wait for connection to complete */
505 /* MS Windows uses int, not SOCKET, for the 1st arg of select(). Wierd! */
506 if (select((int)fd + 1, NULL, &wfds, NULL, tv) <= 0)
509 return(JB_INVALID_SOCKET);
514 #endif /* ndef HAVE_RFC2553 */
517 /*********************************************************************
519 * Function : write_socket
521 * Description : Write the contents of buf (for n bytes) to socket fd.
524 * 1 : fd = file descriptor (aka. handle) of socket to write to.
525 * 2 : buf = pointer to data to be written.
526 * 3 : len = length of data to be written to the socket "fd".
528 * Returns : 0 on success (entire buffer sent).
531 *********************************************************************/
533 int write_socket(jb_socket fd, const char *buf, ssize_t len)
535 int write_socket(jb_socket fd, const char *buf, size_t len)
543 if (len < 0) /* constant condition - size_t isn't ever negative */
548 log_error(LOG_LEVEL_WRITING, "to socket %d: %N", fd, len, buf);
551 return (send(fd, buf, (int)len, 0) != (int)len);
552 #elif defined(__BEOS__) || defined(AMIGA)
553 return (send(fd, buf, len, 0) != len);
554 #elif defined(__OS2__)
556 * Break the data up into SOCKET_SEND_MAX chunks for sending...
557 * OS/2 seemed to complain when the chunks were too large.
559 #define SOCKET_SEND_MAX 65000
561 int send_len, send_rc = 0, i = 0;
562 while ((i < len) && (send_rc != -1))
564 if ((i + SOCKET_SEND_MAX) > len)
567 send_len = SOCKET_SEND_MAX;
568 send_rc = send(fd,(char*)buf + i, send_len, 0);
576 return (write(fd, buf, len) != len);
582 /*********************************************************************
584 * Function : read_socket
586 * Description : Read from a TCP/IP socket in a platform independent way.
589 * 1 : fd = file descriptor of the socket to read
590 * 2 : buf = pointer to buffer where data will be written
591 * Must be >= len bytes long.
592 * 3 : len = maximum number of bytes to read
594 * Returns : On success, the number of bytes read is returned (zero
595 * indicates end of file), and the file position is advanced
596 * by this number. It is not an error if this number is
597 * smaller than the number of bytes requested; this may hap-
598 * pen for example because fewer bytes are actually available
599 * right now (maybe because we were close to end-of-file, or
600 * because we are reading from a pipe, or from a terminal,
601 * or because read() was interrupted by a signal). On error,
602 * -1 is returned, and errno is set appropriately. In this
603 * case it is left unspecified whether the file position (if
606 *********************************************************************/
607 int read_socket(jb_socket fd, char *buf, int len)
617 ret = recv(fd, buf, len, 0);
618 #elif defined(__BEOS__) || defined(AMIGA) || defined(__OS2__)
619 ret = recv(fd, buf, (size_t)len, 0);
621 ret = (int)read(fd, buf, (size_t)len);
626 log_error(LOG_LEVEL_RECEIVED, "from socket %d: %N", fd, ret, buf);
633 /*********************************************************************
635 * Function : data_is_available
637 * Description : Waits for data to arrive on a socket.
640 * 1 : fd = file descriptor of the socket to read
641 * 2 : seconds_to_wait = number of seconds after which we give up.
643 * Returns : TRUE if data arrived in time,
646 *********************************************************************/
647 int data_is_available(jb_socket fd, int seconds_to_wait)
651 struct timeval timeout;
654 memset(&timeout, 0, sizeof(timeout));
655 timeout.tv_sec = seconds_to_wait;
658 /* Copy and pasted from jcc.c ... */
659 memset(&rfds, 0, sizeof(fd_set));
665 n = select(fd+1, &rfds, NULL, NULL, &timeout);
668 * XXX: Do we care about the different error conditions?
670 return ((n == 1) && (1 == recv(fd, buf, 1, MSG_PEEK)));
674 /*********************************************************************
676 * Function : close_socket
678 * Description : Closes a TCP/IP socket
681 * 1 : fd = file descriptor of socket to be closed
685 *********************************************************************/
686 void close_socket(jb_socket fd)
688 #if defined(_WIN32) || defined(__BEOS__)
692 #elif defined(__OS2__)
701 /*********************************************************************
703 * Function : bind_port
705 * Description : Call socket, set socket options, and listen.
706 * Called by listen_loop to "boot up" our proxy address.
709 * 1 : hostnam = TCP/IP address to bind/listen to
710 * 2 : portnum = port to listen on
711 * 3 : pfd = pointer used to return file descriptor.
713 * Returns : if success, returns 0 and sets *pfd.
714 * if failure, returns -3 if address is in use,
715 * -2 if address unresolvable,
717 *********************************************************************/
718 int bind_port(const char *hostnam, int portnum, jb_socket *pfd)
721 struct addrinfo hints;
722 struct addrinfo *result, *rp;
724 * XXX: portnum should be a string to allow symbolic service
725 * names in the configuration file and to avoid the following
731 struct sockaddr_in inaddr;
732 #endif /* def HAVE_RFC2553 */
736 #endif /* ndef _WIN32 */
738 *pfd = JB_INVALID_SOCKET;
741 retval = snprintf(servnam, sizeof(servnam), "%d", portnum);
742 if ((-1 == retval) || (sizeof(servnam) <= retval))
744 log_error(LOG_LEVEL_ERROR,
745 "Port number (%d) ASCII decimal representation doesn't fit into 6 bytes",
750 memset(&hints, 0, sizeof(struct addrinfo));
754 * XXX: This is a hack. The right thing to do
755 * would be to bind to both AF_INET and AF_INET6.
756 * This will also fail if there is no AF_INET
759 hints.ai_family = AF_INET;
763 hints.ai_family = AF_UNSPEC;
765 hints.ai_socktype = SOCK_STREAM;
766 hints.ai_flags = AI_PASSIVE;
768 hints.ai_flags |= AI_ADDRCONFIG;
770 hints.ai_protocol = 0; /* Realy any stream protocol or TCP only */
771 hints.ai_canonname = NULL;
772 hints.ai_addr = NULL;
773 hints.ai_next = NULL;
775 if ((retval = getaddrinfo(hostnam, servnam, &hints, &result)))
777 log_error(LOG_LEVEL_ERROR,
778 "Can not resolve %s: %s", hostnam, gai_strerror(retval));
782 memset((char *)&inaddr, '\0', sizeof inaddr);
784 inaddr.sin_family = AF_INET;
785 inaddr.sin_addr.s_addr = resolve_hostname_to_ip(hostnam);
787 if (inaddr.sin_addr.s_addr == INADDR_NONE)
793 if (sizeof(inaddr.sin_port) == sizeof(short))
794 #endif /* ndef _WIN32 */
796 inaddr.sin_port = htons((unsigned short) portnum);
801 inaddr.sin_port = htonl((unsigned long) portnum);
803 #endif /* ndef _WIN32 */
804 #endif /* def HAVE_RFC2553 */
807 for (rp = result; rp != NULL; rp = rp->ai_next)
809 fd = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol);
811 fd = socket(AF_INET, SOCK_STREAM, 0);
812 #endif /* def HAVE_RFC2553 */
815 if (fd == JB_INVALID_SOCKET)
829 * This is not needed for Win32 - in fact, it stops
830 * duplicate instances of Privoxy from being caught.
832 * On UNIX, we assume the user is sensible enough not
833 * to start Privoxy multiple times on the same IP.
834 * Without this, stopping and restarting Privoxy
835 * from a script fails.
836 * Note: SO_REUSEADDR is meant to only take over
837 * sockets which are *not* in listen state in Linux,
838 * e.g. sockets in TIME_WAIT. YMMV.
840 setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char *)&one, sizeof(one));
841 #endif /* ndef _WIN32 */
844 if (bind(fd, rp->ai_addr, rp->ai_addrlen) < 0)
846 if (bind(fd, (struct sockaddr *)&inaddr, sizeof(inaddr)) < 0)
850 errno = WSAGetLastError();
851 if (errno == WSAEADDRINUSE)
853 if (errno == EADDRINUSE)
857 freeaddrinfo(result);
874 /* bind() succeeded, escape from for-loop */
876 * XXX: Support multiple listening sockets (e.g. localhost
877 * resolves to AF_INET and AF_INET6, but only the first address
884 freeaddrinfo(result);
887 /* All bind()s failed */
890 #endif /* ndef HAVE_RFC2553 */
892 while (listen(fd, MAX_LISTEN_BACKLOG) == -1)
906 /*********************************************************************
908 * Function : get_host_information
910 * Description : Determines the IP address the client used to
911 * reach us and the hostname associated with it.
913 * XXX: Most of the code has been copy and pasted
914 * from accept_connection() and not all of the
915 * ifdefs paths have been tested afterwards.
918 * 1 : afd = File descriptor returned from accept().
919 * 2 : ip_address = Pointer to return the pointer to
920 * the ip address string.
921 * 3 : hostname = Pointer to return the pointer to
922 * the hostname or NULL if the caller
923 * isn't interested in it.
927 *********************************************************************/
928 void get_host_information(jb_socket afd, char **ip_address, char **hostname)
931 struct sockaddr_storage server;
934 struct sockaddr_in server;
935 struct hostent *host = NULL;
936 #endif /* HAVE_RFC2553 */
937 #if defined(_WIN32) || defined(__OS2__) || defined(__APPLE_CC__) || defined(AMIGA)
938 /* according to accept_connection() this fixes a warning. */
939 int s_length, s_length_provided;
941 socklen_t s_length, s_length_provided;
944 #if defined(HAVE_GETHOSTBYADDR_R_8_ARGS) || defined(HAVE_GETHOSTBYADDR_R_7_ARGS) || defined(HAVE_GETHOSTBYADDR_R_5_ARGS)
945 struct hostent result;
946 #if defined(HAVE_GETHOSTBYADDR_R_5_ARGS)
947 struct hostent_data hdata;
949 char hbuf[HOSTENT_BUFFER_SIZE];
951 #endif /* def HAVE_GETHOSTBYADDR_R_5_ARGS */
952 #endif /* def HAVE_GETHOSTBYADDR_R_(8|7|5)_ARGS */
953 #endif /* ifndef HAVE_RFC2553 */
954 s_length = s_length_provided = sizeof(server);
956 if (NULL != hostname)
962 if (!getsockname(afd, (struct sockaddr *) &server, &s_length))
964 if (s_length > s_length_provided)
966 log_error(LOG_LEVEL_ERROR, "getsockname() truncated server address");
970 *ip_address = malloc(NI_MAXHOST);
971 if (NULL == *ip_address)
973 log_error(LOG_LEVEL_ERROR,
974 "Out of memory while getting the client's IP address.");
977 retval = getnameinfo((struct sockaddr *) &server, s_length,
978 *ip_address, NI_MAXHOST, NULL, 0, NI_NUMERICHOST);
981 log_error(LOG_LEVEL_ERROR,
982 "Unable to print my own IP address: %s", gai_strerror(retval));
987 *ip_address = strdup(inet_ntoa(server.sin_addr));
988 #endif /* HAVE_RFC2553 */
989 if (NULL == hostname)
992 * We're done here, the caller isn't
993 * interested in knowing the hostname.
999 *hostname = malloc(NI_MAXHOST);
1000 if (NULL == *hostname)
1002 log_error(LOG_LEVEL_ERROR,
1003 "Out of memory while getting the client's hostname.");
1006 retval = getnameinfo((struct sockaddr *) &server, s_length,
1007 *hostname, NI_MAXHOST, NULL, 0, NI_NAMEREQD);
1010 log_error(LOG_LEVEL_ERROR,
1011 "Unable to resolve my own IP address: %s", gai_strerror(retval));
1015 #if defined(HAVE_GETHOSTBYADDR_R_8_ARGS)
1016 gethostbyaddr_r((const char *)&server.sin_addr,
1017 sizeof(server.sin_addr), AF_INET,
1018 &result, hbuf, HOSTENT_BUFFER_SIZE,
1020 #elif defined(HAVE_GETHOSTBYADDR_R_7_ARGS)
1021 host = gethostbyaddr_r((const char *)&server.sin_addr,
1022 sizeof(server.sin_addr), AF_INET,
1023 &result, hbuf, HOSTENT_BUFFER_SIZE, &thd_err);
1024 #elif defined(HAVE_GETHOSTBYADDR_R_5_ARGS)
1025 if (0 == gethostbyaddr_r((const char *)&server.sin_addr,
1026 sizeof(server.sin_addr), AF_INET,
1035 #elif defined(MUTEX_LOCKS_AVAILABLE)
1036 privoxy_mutex_lock(&resolver_mutex);
1037 host = gethostbyaddr((const char *)&server.sin_addr,
1038 sizeof(server.sin_addr), AF_INET);
1039 privoxy_mutex_unlock(&resolver_mutex);
1041 host = gethostbyaddr((const char *)&server.sin_addr,
1042 sizeof(server.sin_addr), AF_INET);
1046 log_error(LOG_LEVEL_ERROR, "Unable to get my own hostname: %E\n");
1050 *hostname = strdup(host->h_name);
1052 #endif /* else def HAVE_RFC2553 */
1059 /*********************************************************************
1061 * Function : accept_connection
1063 * Description : Accepts a connection on a socket. Socket must have
1064 * been created using bind_port().
1067 * 1 : csp = Client state, cfd, ip_addr_str, and
1068 * ip_addr_long will be set by this routine.
1069 * 2 : fd = file descriptor returned from bind_port
1071 * Returns : when a connection is accepted, it returns 1 (TRUE).
1072 * On an error it returns 0 (FALSE).
1074 *********************************************************************/
1075 int accept_connection(struct client_state * csp, jb_socket fd)
1078 /* XXX: client is stored directly into csp->tcp_addr */
1079 #define client (csp->tcp_addr)
1082 struct sockaddr_in client;
1085 #if defined(_WIN32) || defined(__OS2__) || defined(__APPLE_CC__) || defined(AMIGA)
1086 /* Wierdness - fix a warning. */
1092 c_length = sizeof(client);
1095 afd = accept (fd, (struct sockaddr *) &client, &c_length);
1096 if (afd == JB_INVALID_SOCKET)
1103 #if defined(FEATURE_ACCEPT_FILTER) && defined(SO_ACCEPTFILTER)
1104 struct accept_filter_arg af_options;
1105 bzero(&af_options, sizeof(af_options));
1106 strlcpy(af_options.af_name, "httpready", sizeof(af_options.af_name));
1107 setsockopt(fd, SOL_SOCKET, SO_ACCEPTFILTER, &af_options, sizeof(af_options));
1109 afd = accept (fd, (struct sockaddr *) &client, &c_length);
1110 } while (afd < 1 && errno == EINTR);
1119 csp->ip_addr_str = malloc(NI_MAXHOST);
1120 if (NULL == csp->ip_addr_str)
1122 log_error(LOG_LEVEL_ERROR,
1123 "Out of memory while getting the client's IP address.");
1126 retval = getnameinfo((struct sockaddr *) &client, c_length,
1127 csp->ip_addr_str, NI_MAXHOST, NULL, 0, NI_NUMERICHOST);
1128 if (!csp->ip_addr_str || retval)
1130 log_error(LOG_LEVEL_ERROR, "Can not save csp->ip_addr_str: %s",
1131 (csp->ip_addr_str) ? gai_strerror(retval) : "Insuffcient memory");
1132 freez(csp->ip_addr_str);
1136 csp->ip_addr_str = strdup(inet_ntoa(client.sin_addr));
1137 csp->ip_addr_long = ntohl(client.sin_addr.s_addr);
1138 #endif /* def HAVE_RFC2553 */
1145 /*********************************************************************
1147 * Function : resolve_hostname_to_ip
1149 * Description : Resolve a hostname to an internet tcp/ip address.
1150 * NULL or an empty string resolve to INADDR_ANY.
1153 * 1 : host = hostname to resolve
1155 * Returns : INADDR_NONE => failure, INADDR_ANY or tcp/ip address if succesful.
1157 *********************************************************************/
1158 unsigned long resolve_hostname_to_ip(const char *host)
1160 struct sockaddr_in inaddr;
1161 struct hostent *hostp;
1162 #if defined(HAVE_GETHOSTBYNAME_R_6_ARGS) || defined(HAVE_GETHOSTBYNAME_R_5_ARGS) || defined(HAVE_GETHOSTBYNAME_R_3_ARGS)
1163 struct hostent result;
1164 #if defined(HAVE_GETHOSTBYNAME_R_6_ARGS) || defined(HAVE_GETHOSTBYNAME_R_5_ARGS)
1165 char hbuf[HOSTENT_BUFFER_SIZE];
1167 #else /* defined(HAVE_GETHOSTBYNAME_R_3_ARGS) */
1168 struct hostent_data hdata;
1169 #endif /* def HAVE_GETHOSTBYNAME_R_(6|5)_ARGS */
1170 #endif /* def HAVE_GETHOSTBYNAME_R_(6|5|3)_ARGS */
1172 if ((host == NULL) || (*host == '\0'))
1177 memset((char *) &inaddr, 0, sizeof inaddr);
1179 if ((inaddr.sin_addr.s_addr = inet_addr(host)) == -1)
1181 unsigned int dns_retries = 0;
1182 #if defined(HAVE_GETHOSTBYNAME_R_6_ARGS)
1183 while (gethostbyname_r(host, &result, hbuf,
1184 HOSTENT_BUFFER_SIZE, &hostp, &thd_err)
1185 && (thd_err == TRY_AGAIN) && (dns_retries++ < MAX_DNS_RETRIES))
1187 log_error(LOG_LEVEL_ERROR,
1188 "Timeout #%u while trying to resolve %s. Trying again.",
1191 #elif defined(HAVE_GETHOSTBYNAME_R_5_ARGS)
1192 while (NULL == (hostp = gethostbyname_r(host, &result,
1193 hbuf, HOSTENT_BUFFER_SIZE, &thd_err))
1194 && (thd_err == TRY_AGAIN) && (dns_retries++ < MAX_DNS_RETRIES))
1196 log_error(LOG_LEVEL_ERROR,
1197 "Timeout #%u while trying to resolve %s. Trying again.",
1200 #elif defined(HAVE_GETHOSTBYNAME_R_3_ARGS)
1202 * XXX: Doesn't retry in case of soft errors.
1203 * Does this gethostbyname_r version set h_errno?
1205 if (0 == gethostbyname_r(host, &result, &hdata))
1213 #elif defined(MUTEX_LOCKS_AVAILABLE)
1214 privoxy_mutex_lock(&resolver_mutex);
1215 while (NULL == (hostp = gethostbyname(host))
1216 && (h_errno == TRY_AGAIN) && (dns_retries++ < MAX_DNS_RETRIES))
1218 log_error(LOG_LEVEL_ERROR,
1219 "Timeout #%u while trying to resolve %s. Trying again.",
1222 privoxy_mutex_unlock(&resolver_mutex);
1224 while (NULL == (hostp = gethostbyname(host))
1225 && (h_errno == TRY_AGAIN) && (dns_retries++ < MAX_DNS_RETRIES))
1227 log_error(LOG_LEVEL_ERROR,
1228 "Timeout #%u while trying to resolve %s. Trying again.",
1231 #endif /* def HAVE_GETHOSTBYNAME_R_(6|5|3)_ARGS */
1233 * On Mac OSX, if a domain exists but doesn't have a type A
1234 * record associated with it, the h_addr member of the struct
1235 * hostent returned by gethostbyname is NULL, even if h_length
1236 * is 4. Therefore the second test below.
1238 if (hostp == NULL || hostp->h_addr == NULL)
1241 log_error(LOG_LEVEL_ERROR, "could not resolve hostname %s", host);
1242 return(INADDR_NONE);
1244 if (hostp->h_addrtype != AF_INET)
1247 errno = WSAEPROTOTYPE;
1251 log_error(LOG_LEVEL_ERROR, "hostname %s resolves to unknown address type.", host);
1252 return(INADDR_NONE);
1255 (char *) &inaddr.sin_addr,
1256 (char *) hostp->h_addr,
1257 sizeof(inaddr.sin_addr)
1260 return(inaddr.sin_addr.s_addr);
1265 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
1266 /*********************************************************************
1268 * Function : socket_is_still_alive
1270 * Description : Figures out whether or not a socket is still alive.
1273 * 1 : sfd = The socket to check.
1275 * Returns : TRUE for yes, otherwise FALSE.
1277 *********************************************************************/
1278 int socket_is_still_alive(jb_socket sfd)
1281 int no_data_waiting;
1285 struct pollfd poll_fd[1];
1287 memset(poll_fd, 0, sizeof(poll_fd));
1288 poll_fd[0].fd = sfd;
1289 poll_fd[0].events = POLLIN;
1291 poll_result = poll(poll_fd, 1, 0);
1293 if (-1 == poll_result)
1295 log_error(LOG_LEVEL_CONNECT, "Polling socket %d failed.", sfd);
1298 no_data_waiting = !(poll_fd[0].revents & POLLIN);
1300 fd_set readable_fds;
1301 struct timeval timeout;
1304 memset(&timeout, '\0', sizeof(timeout));
1305 FD_ZERO(&readable_fds);
1306 FD_SET(sfd, &readable_fds);
1308 ret = select((int)sfd+1, &readable_fds, NULL, NULL, &timeout);
1311 log_error(LOG_LEVEL_CONNECT, "select() on socket %d failed: %E", sfd);
1314 no_data_waiting = !FD_ISSET(sfd, &readable_fds);
1315 #endif /* def HAVE_POLL */
1317 return (no_data_waiting || (1 == recv(sfd, buf, 1, MSG_PEEK)));
1319 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */