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- /*********************************************************************
- *
- * File : $Source: /cvsroot/ijbswa/current/jbsockets.c,v $
- *
- * Purpose : Contains wrappers for system-specific sockets code,
- * so that the rest of Privoxy can be more
- * OS-independent. Contains #ifdefs to make this work
- * on many platforms.
- *
- * Copyright : Written by and Copyright (C) 2001-2017 the
- * Privoxy team. https://www.privoxy.org/
- *
- * Based on the Internet Junkbuster originally written
- * by and Copyright (C) 1997 Anonymous Coders and
- * Junkbusters Corporation. http://www.junkbusters.com
- *
- * This program is free software; you can redistribute it
- * and/or modify it under the terms of the GNU General
- * Public License as published by the Free Software
- * Foundation; either version 2 of the License, or (at
- * your option) any later version.
- *
- * This program is distributed in the hope that it will
- * be useful, but WITHOUT ANY WARRANTY; without even the
- * implied warranty of MERCHANTABILITY or FITNESS FOR A
- * PARTICULAR PURPOSE. See the GNU General Public
- * License for more details.
- *
- * The GNU General Public License should be included with
- * this file. If not, you can view it at
- * http://www.gnu.org/copyleft/gpl.html
- * or write to the Free Software Foundation, Inc., 59
- * Temple Place - Suite 330, Boston, MA 02111-1307, USA.
- *
- *********************************************************************/
- #include "config.h"
- #include <stdlib.h>
- #include <stdio.h>
- #include <string.h>
- #include <errno.h>
- #include <fcntl.h>
- #include <sys/types.h>
- #ifdef _WIN32
- #ifndef STRICT
- #define STRICT
- #endif
- #include <winsock2.h>
- #include <windows.h>
- #include <sys/timeb.h>
- #include <io.h>
- #else
- #include <unistd.h>
- #include <sys/time.h>
- #include <netinet/in.h>
- #include <sys/ioctl.h>
- #include <netdb.h>
- #include <sys/socket.h>
- #ifndef __BEOS__
- #include <netinet/tcp.h>
- #include <arpa/inet.h>
- #else
- #include <socket.h>
- #endif
- #endif
- #ifdef HAVE_POLL
- #ifdef __GLIBC__
- #include <sys/poll.h>
- #else
- #include <poll.h>
- #endif /* def __GLIBC__ */
- #endif /* HAVE_POLL */
- #include "project.h"
- /* For mutex semaphores only */
- #include "jcc.h"
- #include "jbsockets.h"
- #include "filters.h"
- #include "errlog.h"
- #include "miscutil.h"
- /* Mac OSX doesn't define AI_NUMERICSESRV */
- #ifndef AI_NUMERICSERV
- #define AI_NUMERICSERV 0
- #endif
- /*
- * Maximum number of gethostbyname(_r) retries in case of
- * soft errors (TRY_AGAIN).
- * XXX: Does it make sense to make this a config option?
- */
- #define MAX_DNS_RETRIES 10
- #ifdef HAVE_RFC2553
- static jb_socket rfc2553_connect_to(const char *host, int portnum, struct client_state *csp);
- #else
- static jb_socket no_rfc2553_connect_to(const char *host, int portnum, struct client_state *csp);
- #endif
- /*********************************************************************
- *
- * Function : set_no_delay_flag
- *
- * Description : Disables the Nagle algorithm (TCP send coalescence)
- * for the given socket.
- *
- * Parameters :
- * 1 : fd = The file descriptor to operate on
- *
- * Returns : void
- *
- *********************************************************************/
- static void set_no_delay_flag(int fd)
- {
- #ifdef TCP_NODELAY
- int mi = 1;
- if (setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &mi, sizeof(int)))
- {
- log_error(LOG_LEVEL_ERROR,
- "Failed to disable TCP coalescence for socket %d", fd);
- }
- #else
- #warning set_no_delay_flag() is a nop due to lack of TCP_NODELAY
- #endif /* def TCP_NODELAY */
- }
- /*********************************************************************
- *
- * Function : connect_to
- *
- * Description : Open a socket and connect to it. Will check
- * that this is allowed according to ACL.
- *
- * Parameters :
- * 1 : host = hostname to connect to
- * 2 : portnum = port to connect to (XXX: should be unsigned)
- * 3 : csp = Current client state (buffers, headers, etc...)
- *
- * Returns : JB_INVALID_SOCKET => failure, else it is the socket
- * file descriptor.
- *
- *********************************************************************/
- jb_socket connect_to(const char *host, int portnum, struct client_state *csp)
- {
- jb_socket fd;
- int forwarded_connect_retries = 0;
- do
- {
- /*
- * XXX: The whole errno overloading is ridiculous and should
- * be replaced with something sane and thread safe
- */
- /* errno = 0;*/
- #ifdef HAVE_RFC2553
- fd = rfc2553_connect_to(host, portnum, csp);
- #else
- fd = no_rfc2553_connect_to(host, portnum, csp);
- #endif
- if ((fd != JB_INVALID_SOCKET) || (errno == EINVAL)
- || (csp->fwd == NULL)
- || ((csp->fwd->forward_host == NULL) && (csp->fwd->type == SOCKS_NONE)))
- {
- break;
- }
- forwarded_connect_retries++;
- if (csp->config->forwarded_connect_retries != 0)
- {
- log_error(LOG_LEVEL_ERROR,
- "Attempt %d of %d to connect to %s failed. Trying again.",
- forwarded_connect_retries, csp->config->forwarded_connect_retries + 1, host);
- }
- } while (forwarded_connect_retries < csp->config->forwarded_connect_retries);
- return fd;
- }
- #ifdef HAVE_RFC2553
- /* Getaddrinfo implementation */
- static jb_socket rfc2553_connect_to(const char *host, int portnum, struct client_state *csp)
- {
- struct addrinfo hints, *result, *rp;
- char service[6];
- int retval;
- jb_socket fd;
- #ifdef HAVE_POLL
- struct pollfd poll_fd[1];
- #else
- fd_set wfds;
- struct timeval timeout;
- #endif
- #if !defined(_WIN32) && !defined(__BEOS__)
- int flags;
- #endif
- int connect_failed;
- /*
- * XXX: Initializing it here is only necessary
- * because not all situations are properly
- * covered yet.
- */
- int socket_error = 0;
- #ifdef FEATURE_ACL
- struct access_control_addr dst[1];
- #endif /* def FEATURE_ACL */
- /* Don't leak memory when retrying. */
- freez(csp->error_message);
- freez(csp->http->host_ip_addr_str);
- retval = snprintf(service, sizeof(service), "%d", portnum);
- if ((-1 == retval) || (sizeof(service) <= retval))
- {
- log_error(LOG_LEVEL_ERROR,
- "Port number (%d) ASCII decimal representation doesn't fit into 6 bytes",
- portnum);
- csp->error_message = strdup("Invalid port number");
- csp->http->host_ip_addr_str = strdup("unknown");
- return(JB_INVALID_SOCKET);
- }
- memset((char *)&hints, 0, sizeof(hints));
- hints.ai_family = AF_UNSPEC;
- hints.ai_socktype = SOCK_STREAM;
- hints.ai_flags = AI_NUMERICSERV; /* avoid service look-up */
- #ifdef AI_ADDRCONFIG
- hints.ai_flags |= AI_ADDRCONFIG;
- #endif
- if ((retval = getaddrinfo(host, service, &hints, &result)))
- {
- log_error(LOG_LEVEL_INFO,
- "Can not resolve %s: %s", host, gai_strerror(retval));
- csp->error_message = strdup(gai_strerror(retval));
- csp->http->host_ip_addr_str = strdup("unknown");
- /* XXX: Should find a better way to propagate this error. */
- errno = EINVAL;
- return(JB_INVALID_SOCKET);
- }
- csp->http->host_ip_addr_str = malloc_or_die(NI_MAXHOST);
- for (rp = result; rp != NULL; rp = rp->ai_next)
- {
- #ifdef FEATURE_ACL
- memcpy(&dst->addr, rp->ai_addr, rp->ai_addrlen);
- if (block_acl(dst, csp))
- {
- socket_error = errno = EPERM;
- continue;
- }
- #endif /* def FEATURE_ACL */
- retval = getnameinfo(rp->ai_addr, rp->ai_addrlen,
- csp->http->host_ip_addr_str, NI_MAXHOST, NULL, 0, NI_NUMERICHOST);
- if (retval)
- {
- log_error(LOG_LEVEL_ERROR,
- "Failed to get the host name from the socket structure: %s",
- gai_strerror(retval));
- continue;
- }
- fd = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol);
- #ifdef _WIN32
- if (fd == JB_INVALID_SOCKET)
- #else
- if (fd < 0)
- #endif
- {
- continue;
- }
- #ifndef HAVE_POLL
- #ifndef _WIN32
- if (fd >= FD_SETSIZE)
- {
- log_error(LOG_LEVEL_ERROR,
- "Server socket number too high to use select(): %d >= %d",
- fd, FD_SETSIZE);
- close_socket(fd);
- freeaddrinfo(result);
- return JB_INVALID_SOCKET;
- }
- #endif
- #endif
- #ifdef FEATURE_EXTERNAL_FILTERS
- mark_socket_for_close_on_execute(fd);
- #endif
- set_no_delay_flag(fd);
- #if !defined(_WIN32) && !defined(__BEOS__)
- if ((flags = fcntl(fd, F_GETFL, 0)) != -1)
- {
- flags |= O_NDELAY;
- fcntl(fd, F_SETFL, flags);
- }
- #endif /* !defined(_WIN32) && !defined(__BEOS__) */
- connect_failed = 0;
- while (connect(fd, rp->ai_addr, rp->ai_addrlen) == JB_INVALID_SOCKET)
- {
- #ifdef _WIN32
- if (errno == WSAEINPROGRESS)
- #else /* ifndef _WIN32 */
- if (errno == EINPROGRESS)
- #endif /* ndef _WIN32 */
- {
- break;
- }
- if (errno != EINTR)
- {
- socket_error = errno;
- close_socket(fd);
- connect_failed = 1;
- break;
- }
- }
- if (connect_failed)
- {
- continue;
- }
- #if !defined(_WIN32) && !defined(__BEOS__)
- if (flags != -1)
- {
- flags &= ~O_NDELAY;
- fcntl(fd, F_SETFL, flags);
- }
- #endif /* !defined(_WIN32) && !defined(__BEOS__) */
- #ifdef HAVE_POLL
- poll_fd[0].fd = fd;
- poll_fd[0].events = POLLOUT;
- retval = poll(poll_fd, 1, 30000);
- if (retval == 0)
- {
- if (rp->ai_next != NULL)
- {
- /* Log this now as we'll try another address next */
- log_error(LOG_LEVEL_CONNECT,
- "Could not connect to [%s]:%s: Operation timed out.",
- csp->http->host_ip_addr_str, service);
- }
- else
- {
- /*
- * This is the last address, don't log this now
- * as it would result in a duplicated log message.
- */
- socket_error = ETIMEDOUT;
- }
- }
- else if (retval > 0)
- #else
- /* wait for connection to complete */
- FD_ZERO(&wfds);
- FD_SET(fd, &wfds);
- memset(&timeout, 0, sizeof(timeout));
- timeout.tv_sec = 30;
- /* MS Windows uses int, not SOCKET, for the 1st arg of select(). Weird! */
- if ((select((int)fd + 1, NULL, &wfds, NULL, &timeout) > 0)
- && FD_ISSET(fd, &wfds))
- #endif
- {
- socklen_t optlen = sizeof(socket_error);
- if (!getsockopt(fd, SOL_SOCKET, SO_ERROR, &socket_error, &optlen))
- {
- if (!socket_error)
- {
- /* Connection established, no need to try other addresses. */
- break;
- }
- if (rp->ai_next != NULL)
- {
- /*
- * There's another address we can try, so log that this
- * one didn't work out. If the last one fails, too,
- * it will get logged outside the loop body so we don't
- * have to mention it here.
- */
- log_error(LOG_LEVEL_CONNECT, "Could not connect to [%s]:%s: %s.",
- csp->http->host_ip_addr_str, service, strerror(socket_error));
- }
- }
- else
- {
- socket_error = errno;
- log_error(LOG_LEVEL_ERROR, "Could not get the state of "
- "the connection to [%s]:%s: %s; dropping connection.",
- csp->http->host_ip_addr_str, service, strerror(errno));
- }
- }
- /* Connection failed, try next address */
- close_socket(fd);
- }
- freeaddrinfo(result);
- if (!rp)
- {
- log_error(LOG_LEVEL_CONNECT, "Could not connect to [%s]:%s: %s.",
- host, service, strerror(socket_error));
- csp->error_message = strdup(strerror(socket_error));
- return(JB_INVALID_SOCKET);
- }
- log_error(LOG_LEVEL_CONNECT, "Connected to %s[%s]:%s.",
- host, csp->http->host_ip_addr_str, service);
- return(fd);
- }
- #else /* ndef HAVE_RFC2553 */
- /* Pre-getaddrinfo implementation */
- static jb_socket no_rfc2553_connect_to(const char *host, int portnum, struct client_state *csp)
- {
- struct sockaddr_in inaddr;
- jb_socket fd;
- unsigned int addr;
- #ifdef HAVE_POLL
- struct pollfd poll_fd[1];
- #else
- fd_set wfds;
- struct timeval tv[1];
- #endif
- #if !defined(_WIN32) && !defined(__BEOS__)
- int flags;
- #endif
- #ifdef FEATURE_ACL
- struct access_control_addr dst[1];
- #endif /* def FEATURE_ACL */
- /* Don't leak memory when retrying. */
- freez(csp->http->host_ip_addr_str);
- memset((char *)&inaddr, 0, sizeof inaddr);
- if ((addr = resolve_hostname_to_ip(host)) == INADDR_NONE)
- {
- csp->http->host_ip_addr_str = strdup("unknown");
- return(JB_INVALID_SOCKET);
- }
- #ifdef FEATURE_ACL
- dst->addr = ntohl(addr);
- dst->port = portnum;
- if (block_acl(dst, csp))
- {
- errno = EPERM;
- return(JB_INVALID_SOCKET);
- }
- #endif /* def FEATURE_ACL */
- inaddr.sin_addr.s_addr = addr;
- inaddr.sin_family = AF_INET;
- csp->http->host_ip_addr_str = strdup(inet_ntoa(inaddr.sin_addr));
- #ifndef _WIN32
- if (sizeof(inaddr.sin_port) == sizeof(short))
- #endif /* ndef _WIN32 */
- {
- inaddr.sin_port = htons((unsigned short) portnum);
- }
- #ifndef _WIN32
- else
- {
- inaddr.sin_port = htonl((unsigned long)portnum);
- }
- #endif /* ndef _WIN32 */
- fd = socket(inaddr.sin_family, SOCK_STREAM, 0);
- #ifdef _WIN32
- if (fd == JB_INVALID_SOCKET)
- #else
- if (fd < 0)
- #endif
- {
- return(JB_INVALID_SOCKET);
- }
- #ifndef HAVE_POLL
- #ifndef _WIN32
- if (fd >= FD_SETSIZE)
- {
- log_error(LOG_LEVEL_ERROR,
- "Server socket number too high to use select(): %d >= %d",
- fd, FD_SETSIZE);
- close_socket(fd);
- return JB_INVALID_SOCKET;
- }
- #endif
- #endif
- set_no_delay_flag(fd);
- #if !defined(_WIN32) && !defined(__BEOS__)
- if ((flags = fcntl(fd, F_GETFL, 0)) != -1)
- {
- flags |= O_NDELAY;
- fcntl(fd, F_SETFL, flags);
- #ifdef FEATURE_EXTERNAL_FILTERS
- mark_socket_for_close_on_execute(fd);
- #endif
- }
- #endif /* !defined(_WIN32) && !defined(__BEOS__) */
- while (connect(fd, (struct sockaddr *) & inaddr, sizeof inaddr) == JB_INVALID_SOCKET)
- {
- #ifdef _WIN32
- if (errno == WSAEINPROGRESS)
- #else /* ifndef _WIN32 */
- if (errno == EINPROGRESS)
- #endif /* ndef _WIN32 */
- {
- break;
- }
- if (errno != EINTR)
- {
- close_socket(fd);
- return(JB_INVALID_SOCKET);
- }
- }
- #if !defined(_WIN32) && !defined(__BEOS__)
- if (flags != -1)
- {
- flags &= ~O_NDELAY;
- fcntl(fd, F_SETFL, flags);
- }
- #endif /* !defined(_WIN32) && !defined(__BEOS__) */
- #ifdef HAVE_POLL
- poll_fd[0].fd = fd;
- poll_fd[0].events = POLLOUT;
- if (poll(poll_fd, 1, 30000) <= 0)
- #else
- /* wait for connection to complete */
- FD_ZERO(&wfds);
- FD_SET(fd, &wfds);
- tv->tv_sec = 30;
- tv->tv_usec = 0;
- /* MS Windows uses int, not SOCKET, for the 1st arg of select(). Weird! */
- if (select((int)fd + 1, NULL, &wfds, NULL, tv) <= 0)
- #endif
- {
- close_socket(fd);
- return(JB_INVALID_SOCKET);
- }
- return(fd);
- }
- #endif /* ndef HAVE_RFC2553 */
- /*********************************************************************
- *
- * Function : write_socket
- *
- * Description : Write the contents of buf (for n bytes) to socket fd.
- *
- * Parameters :
- * 1 : fd = file descriptor (aka. handle) of socket to write to.
- * 2 : buf = pointer to data to be written.
- * 3 : len = length of data to be written to the socket "fd".
- *
- * Returns : 0 on success (entire buffer sent).
- * nonzero on error.
- *
- *********************************************************************/
- int write_socket(jb_socket fd, const char *buf, size_t len)
- {
- if (len == 0)
- {
- return 0;
- }
- #ifdef FUZZ
- if (!daemon_mode && fd <= 3)
- {
- log_error(LOG_LEVEL_WRITING, "Pretending to write to socket %d: %N", fd, len, buf);
- return 0;
- }
- #endif
- log_error(LOG_LEVEL_WRITING, "to socket %d: %N", fd, len, buf);
- #if defined(_WIN32)
- return (send(fd, buf, (int)len, 0) != (int)len);
- #elif defined(__BEOS__)
- return (send(fd, buf, len, 0) != len);
- #else
- return (write(fd, buf, len) != len);
- #endif
- }
- /*********************************************************************
- *
- * Function : write_socket_delayed
- *
- * Description : Write the contents of buf (for n bytes) to
- * socket fd, optionally delaying the operation.
- *
- * Parameters :
- * 1 : fd = File descriptor (aka. handle) of socket to write to.
- * 2 : buf = Pointer to data to be written.
- * 3 : len = Length of data to be written to the socket "fd".
- * 4 : delay = Delay in milliseconds.
- *
- * Returns : 0 on success (entire buffer sent).
- * nonzero on error.
- *
- *********************************************************************/
- int write_socket_delayed(jb_socket fd, const char *buf, size_t len, unsigned int delay)
- {
- size_t i = 0;
- if (delay == 0)
- {
- return write_socket(fd, buf, len);
- }
- while (i < len)
- {
- size_t write_length;
- enum {MAX_WRITE_LENGTH = 10};
- if ((i + MAX_WRITE_LENGTH) > len)
- {
- write_length = len - i;
- }
- else
- {
- write_length = MAX_WRITE_LENGTH;
- }
- privoxy_millisleep(delay);
- if (write_socket(fd, buf + i, write_length) != 0)
- {
- return 1;
- }
- i += write_length;
- }
- return 0;
- }
- /*********************************************************************
- *
- * Function : read_socket
- *
- * Description : Read from a TCP/IP socket in a platform independent way.
- *
- * Parameters :
- * 1 : fd = file descriptor of the socket to read
- * 2 : buf = pointer to buffer where data will be written
- * Must be >= len bytes long.
- * 3 : len = maximum number of bytes to read
- *
- * Returns : On success, the number of bytes read is returned (zero
- * indicates end of file), and the file position is advanced
- * by this number. It is not an error if this number is
- * smaller than the number of bytes requested; this may hap-
- * pen for example because fewer bytes are actually available
- * right now (maybe because we were close to end-of-file, or
- * because we are reading from a pipe, or from a terminal,
- * or because read() was interrupted by a signal). On error,
- * -1 is returned, and errno is set appropriately. In this
- * case it is left unspecified whether the file position (if
- * any) changes.
- *
- *********************************************************************/
- int read_socket(jb_socket fd, char *buf, int len)
- {
- int ret;
- if (len <= 0)
- {
- return(0);
- }
- #if defined(_WIN32)
- ret = recv(fd, buf, len, 0);
- #elif defined(__BEOS__)
- ret = recv(fd, buf, (size_t)len, 0);
- #else
- ret = (int)read(fd, buf, (size_t)len);
- #endif
- if (ret > 0)
- {
- log_error(LOG_LEVEL_RECEIVED, "from socket %d: %N", fd, ret, buf);
- }
- return ret;
- }
- /*********************************************************************
- *
- * Function : data_is_available
- *
- * Description : Waits for data to arrive on a socket.
- *
- * Parameters :
- * 1 : fd = file descriptor of the socket to read
- * 2 : seconds_to_wait = number of seconds after which we give up.
- *
- * Returns : TRUE if data arrived in time,
- * FALSE otherwise.
- *
- *********************************************************************/
- int data_is_available(jb_socket fd, int seconds_to_wait)
- {
- int n;
- char buf[10];
- #ifdef HAVE_POLL
- struct pollfd poll_fd[1];
- poll_fd[0].fd = fd;
- poll_fd[0].events = POLLIN;
- n = poll(poll_fd, 1, seconds_to_wait * 1000);
- #else
- fd_set rfds;
- struct timeval timeout;
- memset(&timeout, 0, sizeof(timeout));
- timeout.tv_sec = seconds_to_wait;
- FD_ZERO(&rfds);
- FD_SET(fd, &rfds);
- n = select(fd+1, &rfds, NULL, NULL, &timeout);
- #endif
- /*
- * XXX: Do we care about the different error conditions?
- */
- return ((n == 1) && (1 == recv(fd, buf, 1, MSG_PEEK)));
- }
- /*********************************************************************
- *
- * Function : close_socket
- *
- * Description : Closes a TCP/IP socket
- *
- * Parameters :
- * 1 : fd = file descriptor of socket to be closed
- *
- * Returns : void
- *
- *********************************************************************/
- void close_socket(jb_socket fd)
- {
- #if defined(_WIN32) || defined(__BEOS__)
- closesocket(fd);
- #else
- close(fd);
- #endif
- }
- /*********************************************************************
- *
- * Function : drain_and_close_socket
- *
- * Description : Closes a TCP/IP socket after draining unread data
- *
- * Parameters :
- * 1 : fd = file descriptor of the socket to be closed
- *
- * Returns : void
- *
- *********************************************************************/
- void drain_and_close_socket(jb_socket fd)
- {
- #ifdef FEATURE_CONNECTION_KEEP_ALIVE
- if (socket_is_still_alive(fd))
- #endif
- {
- int bytes_drained_total = 0;
- int bytes_drained;
- #ifdef HAVE_SHUTDOWN
- /* Apparently Windows has shutdown() but not SHUT_WR. */
- #ifndef SHUT_WR
- #define SHUT_WR 1
- #endif
- if (0 != shutdown(fd, SHUT_WR))
- {
- log_error(LOG_LEVEL_CONNECT, "Failed to shutdown socket %d: %E", fd);
- }
- #endif
- #define ARBITRARY_DRAIN_LIMIT 10000
- do
- {
- char drainage[500];
- if (!data_is_available(fd, 0))
- {
- /*
- * If there is no data available right now, don't try
- * to drain the socket as read_socket() could block.
- */
- break;
- }
- bytes_drained = read_socket(fd, drainage, sizeof(drainage));
- if (bytes_drained < 0)
- {
- log_error(LOG_LEVEL_CONNECT, "Failed to drain socket %d: %E", fd);
- }
- else if (bytes_drained > 0)
- {
- bytes_drained_total += bytes_drained;
- if (bytes_drained_total > ARBITRARY_DRAIN_LIMIT)
- {
- log_error(LOG_LEVEL_CONNECT, "Giving up draining socket %d", fd);
- break;
- }
- }
- } while (bytes_drained > 0);
- if (bytes_drained_total != 0)
- {
- log_error(LOG_LEVEL_CONNECT,
- "Drained %d bytes before closing socket %d", bytes_drained_total, fd);
- }
- }
- close_socket(fd);
- }
- /*********************************************************************
- *
- * Function : bind_port
- *
- * Description : Call socket, set socket options, and listen.
- * Called by listen_loop to "boot up" our proxy address.
- *
- * Parameters :
- * 1 : hostnam = TCP/IP address to bind/listen to
- * 2 : portnum = port to listen on
- * 3 : backlog = Listen backlog
- * 4 : pfd = pointer used to return file descriptor.
- *
- * Returns : if success, returns 0 and sets *pfd.
- * if failure, returns -3 if address is in use,
- * -2 if address unresolvable,
- * -1 otherwise
- *********************************************************************/
- int bind_port(const char *hostnam, int portnum, int backlog, jb_socket *pfd)
- {
- #ifdef HAVE_RFC2553
- struct addrinfo hints;
- struct addrinfo *result, *rp;
- /*
- * XXX: portnum should be a string to allow symbolic service
- * names in the configuration file and to avoid the following
- * int2string.
- */
- char servnam[6];
- int retval;
- #else
- struct sockaddr_in inaddr;
- #endif /* def HAVE_RFC2553 */
- jb_socket fd;
- #ifndef _WIN32
- int one = 1;
- #endif /* ndef _WIN32 */
- *pfd = JB_INVALID_SOCKET;
- #ifdef HAVE_RFC2553
- retval = snprintf(servnam, sizeof(servnam), "%d", portnum);
- if ((-1 == retval) || (sizeof(servnam) <= retval))
- {
- log_error(LOG_LEVEL_ERROR,
- "Port number (%d) ASCII decimal representation doesn't fit into 6 bytes",
- portnum);
- return -1;
- }
- memset(&hints, 0, sizeof(struct addrinfo));
- if (hostnam == NULL)
- {
- /*
- * XXX: This is a hack. The right thing to do
- * would be to bind to both AF_INET and AF_INET6.
- * This will also fail if there is no AF_INET
- * version available.
- */
- hints.ai_family = AF_INET;
- }
- else
- {
- hints.ai_family = AF_UNSPEC;
- }
- hints.ai_socktype = SOCK_STREAM;
- hints.ai_flags = AI_PASSIVE;
- hints.ai_protocol = 0; /* Really any stream protocol or TCP only */
- hints.ai_canonname = NULL;
- hints.ai_addr = NULL;
- hints.ai_next = NULL;
- if ((retval = getaddrinfo(hostnam, servnam, &hints, &result)))
- {
- log_error(LOG_LEVEL_ERROR,
- "Can not resolve %s: %s", hostnam, gai_strerror(retval));
- return -2;
- }
- #else
- memset((char *)&inaddr, '\0', sizeof inaddr);
- inaddr.sin_family = AF_INET;
- inaddr.sin_addr.s_addr = resolve_hostname_to_ip(hostnam);
- if (inaddr.sin_addr.s_addr == INADDR_NONE)
- {
- return(-2);
- }
- #ifndef _WIN32
- if (sizeof(inaddr.sin_port) == sizeof(short))
- #endif /* ndef _WIN32 */
- {
- inaddr.sin_port = htons((unsigned short) portnum);
- }
- #ifndef _WIN32
- else
- {
- inaddr.sin_port = htonl((unsigned long) portnum);
- }
- #endif /* ndef _WIN32 */
- #endif /* def HAVE_RFC2553 */
- #ifdef HAVE_RFC2553
- for (rp = result; rp != NULL; rp = rp->ai_next)
- {
- fd = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol);
- #else
- fd = socket(AF_INET, SOCK_STREAM, 0);
- #endif /* def HAVE_RFC2553 */
- #ifdef _WIN32
- if (fd == JB_INVALID_SOCKET)
- #else
- if (fd < 0)
- #endif
- {
- #ifdef HAVE_RFC2553
- continue;
- #else
- return(-1);
- #endif
- }
- #ifdef FEATURE_EXTERNAL_FILTERS
- mark_socket_for_close_on_execute(fd);
- #endif
- #ifndef _WIN32
- /*
- * This is not needed for Win32 - in fact, it stops
- * duplicate instances of Privoxy from being caught.
- *
- * On UNIX, we assume the user is sensible enough not
- * to start Privoxy multiple times on the same IP.
- * Without this, stopping and restarting Privoxy
- * from a script fails.
- * Note: SO_REUSEADDR is meant to only take over
- * sockets which are *not* in listen state in Linux,
- * e.g. sockets in TIME_WAIT. YMMV.
- */
- setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char *)&one, sizeof(one));
- #endif /* ndef _WIN32 */
- #ifdef IP_FREEBIND
- setsockopt(fd, IPPROTO_IP, IP_FREEBIND, (char *)&one, sizeof(one));
- #endif
- #ifdef HAVE_RFC2553
- if (bind(fd, rp->ai_addr, rp->ai_addrlen) < 0)
- #else
- if (bind(fd, (struct sockaddr *)&inaddr, sizeof(inaddr)) < 0)
- #endif
- {
- #ifdef _WIN32
- errno = WSAGetLastError();
- if (errno == WSAEADDRINUSE)
- #else
- if (errno == EADDRINUSE)
- #endif
- {
- #ifdef HAVE_RFC2553
- freeaddrinfo(result);
- #endif
- close_socket(fd);
- return(-3);
- }
- else
- {
- close_socket(fd);
- #ifndef HAVE_RFC2553
- return(-1);
- }
- }
- #else
- }
- }
- else
- {
- /* bind() succeeded, escape from for-loop */
- /*
- * XXX: Support multiple listening sockets (e.g. localhost
- * resolves to AF_INET and AF_INET6, but only the first address
- * is used
- */
- break;
- }
- }
- freeaddrinfo(result);
- if (rp == NULL)
- {
- /* All bind()s failed */
- return(-1);
- }
- #endif /* ndef HAVE_RFC2553 */
- while (listen(fd, backlog) == -1)
- {
- if (errno != EINTR)
- {
- close_socket(fd);
- return(-1);
- }
- }
- *pfd = fd;
- return 0;
- }
- /*********************************************************************
- *
- * Function : get_host_information
- *
- * Description : Determines the IP address the client used to
- * reach us and the hostname associated with it.
- *
- * XXX: Most of the code has been copy and pasted
- * from accept_connection() and not all of the
- * ifdefs paths have been tested afterwards.
- *
- * Parameters :
- * 1 : afd = File descriptor returned from accept().
- * 2 : ip_address = Pointer to return the pointer to
- * the ip address string.
- * 3 : port = Pointer to return the pointer to
- * the TCP port string.
- * 4 : hostname = Pointer to return the pointer to
- * the hostname or NULL if the caller
- * isn't interested in it.
- *
- * Returns : void.
- *
- *********************************************************************/
- void get_host_information(jb_socket afd, char **ip_address, char **port,
- char **hostname)
- {
- #ifdef HAVE_RFC2553
- struct sockaddr_storage server;
- int retval;
- #else
- struct sockaddr_in server;
- struct hostent *host = NULL;
- #endif /* HAVE_RFC2553 */
- #if defined(_WIN32)
- /* according to accept_connection() this fixes a warning. */
- int s_length, s_length_provided;
- #else
- socklen_t s_length, s_length_provided;
- #endif
- #ifndef HAVE_RFC2553
- #if defined(HAVE_GETHOSTBYADDR_R_8_ARGS) || defined(HAVE_GETHOSTBYADDR_R_7_ARGS) || defined(HAVE_GETHOSTBYADDR_R_5_ARGS)
- struct hostent result;
- #if defined(HAVE_GETHOSTBYADDR_R_5_ARGS)
- struct hostent_data hdata;
- #else
- char hbuf[HOSTENT_BUFFER_SIZE];
- int thd_err;
- #endif /* def HAVE_GETHOSTBYADDR_R_5_ARGS */
- #endif /* def HAVE_GETHOSTBYADDR_R_(8|7|5)_ARGS */
- #endif /* ifndef HAVE_RFC2553 */
- s_length = s_length_provided = sizeof(server);
- if (NULL != hostname)
- {
- *hostname = NULL;
- }
- *ip_address = NULL;
- *port = NULL;
- if (!getsockname(afd, (struct sockaddr *) &server, &s_length))
- {
- if (s_length > s_length_provided)
- {
- log_error(LOG_LEVEL_ERROR, "getsockname() truncated server address");
- return;
- }
- /*
- * XXX: Workaround for missing header on Windows when
- * configured with --disable-ipv6-support.
- * The proper fix is to not use NI_MAXSERV in
- * that case. It works by accident on other platforms
- * as <netdb.h> is included unconditionally there.
- */
- #ifndef NI_MAXSERV
- #define NI_MAXSERV 32
- #endif
- *port = malloc_or_die(NI_MAXSERV);
- #ifdef HAVE_RFC2553
- *ip_address = malloc_or_die(NI_MAXHOST);
- retval = getnameinfo((struct sockaddr *) &server, s_length,
- *ip_address, NI_MAXHOST, *port, NI_MAXSERV,
- NI_NUMERICHOST|NI_NUMERICSERV);
- if (retval)
- {
- log_error(LOG_LEVEL_ERROR,
- "Unable to print my own IP address: %s", gai_strerror(retval));
- freez(*ip_address);
- freez(*port);
- return;
- }
- #else
- *ip_address = strdup(inet_ntoa(server.sin_addr));
- snprintf(*port, NI_MAXSERV, "%hu", ntohs(server.sin_port));
- #endif /* HAVE_RFC2553 */
- if (NULL == hostname)
- {
- /*
- * We're done here, the caller isn't
- * interested in knowing the hostname.
- */
- return;
- }
- #ifdef HAVE_RFC2553
- *hostname = malloc_or_die(NI_MAXHOST);
- retval = getnameinfo((struct sockaddr *) &server, s_length,
- *hostname, NI_MAXHOST, NULL, 0, NI_NAMEREQD);
- if (retval)
- {
- log_error(LOG_LEVEL_ERROR,
- "Unable to resolve my own IP address: %s", gai_strerror(retval));
- freez(*hostname);
- }
- #else
- #if defined(HAVE_GETHOSTBYADDR_R_8_ARGS)
- gethostbyaddr_r((const char *)&server.sin_addr,
- sizeof(server.sin_addr), AF_INET,
- &result, hbuf, HOSTENT_BUFFER_SIZE,
- &host, &thd_err);
- #elif defined(HAVE_GETHOSTBYADDR_R_7_ARGS)
- host = gethostbyaddr_r((const char *)&server.sin_addr,
- sizeof(server.sin_addr), AF_INET,
- &result, hbuf, HOSTENT_BUFFER_SIZE, &thd_err);
- #elif defined(HAVE_GETHOSTBYADDR_R_5_ARGS)
- if (0 == gethostbyaddr_r((const char *)&server.sin_addr,
- sizeof(server.sin_addr), AF_INET,
- &result, &hdata))
- {
- host = &result;
- }
- else
- {
- host = NULL;
- }
- #elif defined(MUTEX_LOCKS_AVAILABLE)
- privoxy_mutex_lock(&resolver_mutex);
- host = gethostbyaddr((const char *)&server.sin_addr,
- sizeof(server.sin_addr), AF_INET);
- privoxy_mutex_unlock(&resolver_mutex);
- #else
- host = gethostbyaddr((const char *)&server.sin_addr,
- sizeof(server.sin_addr), AF_INET);
- #endif
- if (host == NULL)
- {
- log_error(LOG_LEVEL_ERROR, "Unable to get my own hostname: %E\n");
- }
- else
- {
- *hostname = strdup(host->h_name);
- }
- #endif /* else def HAVE_RFC2553 */
- }
- return;
- }
- /*********************************************************************
- *
- * Function : accept_connection
- *
- * Description : Accepts a connection on one of possibly multiple
- * sockets. The socket(s) to check must have been
- * created using bind_port().
- *
- * Parameters :
- * 1 : csp = Client state, cfd, ip_addr_str, and
- * ip_addr_long will be set by this routine.
- * 2 : fds = File descriptors returned from bind_port
- *
- * Returns : when a connection is accepted, it returns 1 (TRUE).
- * On an error it returns 0 (FALSE).
- *
- *********************************************************************/
- int accept_connection(struct client_state * csp, jb_socket fds[])
- {
- #ifdef HAVE_RFC2553
- /* XXX: client is stored directly into csp->tcp_addr */
- #define client (csp->tcp_addr)
- #else
- struct sockaddr_in client;
- #endif
- jb_socket afd;
- #if defined(_WIN32)
- /* Weirdness - fix a warning. */
- int c_length;
- #else
- socklen_t c_length;
- #endif
- int retval;
- int i;
- int max_selected_socket;
- #ifdef HAVE_POLL
- struct pollfd poll_fds[MAX_LISTENING_SOCKETS];
- nfds_t polled_sockets;
- #else
- fd_set selected_fds;
- #endif
- jb_socket fd;
- const char *host_addr;
- size_t listen_addr_size;
- c_length = sizeof(client);
- #ifdef HAVE_POLL
- memset(poll_fds, 0, sizeof(poll_fds));
- polled_sockets = 0;
- #else
- /*
- * Wait for a connection on any socket.
- * Return immediately if no socket is listening.
- * XXX: Why not treat this as fatal error?
- */
- FD_ZERO(&selected_fds);
- #endif
- max_selected_socket = 0;
- for (i = 0; i < MAX_LISTENING_SOCKETS; i++)
- {
- if (JB_INVALID_SOCKET != fds[i])
- {
- #ifdef HAVE_POLL
- poll_fds[i].fd = fds[i];
- poll_fds[i].events = POLLIN;
- polled_sockets++;
- #else
- FD_SET(fds[i], &selected_fds);
- #endif
- if (max_selected_socket < fds[i] + 1)
- {
- max_selected_socket = fds[i] + 1;
- }
- }
- }
- if (0 == max_selected_socket)
- {
- return 0;
- }
- do
- {
- #ifdef HAVE_POLL
- retval = poll(poll_fds, polled_sockets, -1);
- #else
- retval = select(max_selected_socket, &selected_fds, NULL, NULL, NULL);
- #endif
- } while (retval < 0 && errno == EINTR);
- if (retval <= 0)
- {
- if (0 == retval)
- {
- log_error(LOG_LEVEL_ERROR,
- "Waiting on new client failed because select(2) returned 0."
- " This should not happen.");
- }
- else
- {
- log_error(LOG_LEVEL_ERROR,
- "Waiting on new client failed because of problems in select(2): "
- "%s.", strerror(errno));
- }
- return 0;
- }
- #ifdef HAVE_POLL
- for (i = 0; i < MAX_LISTENING_SOCKETS && (poll_fds[i].revents == 0); i++);
- #else
- for (i = 0; i < MAX_LISTENING_SOCKETS && !FD_ISSET(fds[i], &selected_fds);
- i++);
- #endif
- if (i >= MAX_LISTENING_SOCKETS)
- {
- log_error(LOG_LEVEL_ERROR,
- "select(2) reported connected clients (number = %u, "
- "descriptor boundary = %u), but none found.",
- retval, max_selected_socket);
- return 0;
- }
- fd = fds[i];
- /* Accept selected connection */
- #ifdef _WIN32
- afd = accept (fd, (struct sockaddr *) &client, &c_length);
- if (afd == JB_INVALID_SOCKET)
- {
- return 0;
- }
- #else
- do
- {
- afd = accept (fd, (struct sockaddr *) &client, &c_length);
- } while (afd < 0 && errno == EINTR);
- if (afd < 0)
- {
- return 0;
- }
- #endif
- #ifdef SO_LINGER
- {
- struct linger linger_options;
- linger_options.l_onoff = 1;
- linger_options.l_linger = 5;
- if (0 != setsockopt(afd, SOL_SOCKET, SO_LINGER, &linger_options, sizeof(linger_options)))
- {
- log_error(LOG_LEVEL_ERROR, "Setting SO_LINGER on socket %d failed.", afd);
- }
- }
- #endif
- #ifndef HAVE_POLL
- #ifndef _WIN32
- if (afd >= FD_SETSIZE)
- {
- log_error(LOG_LEVEL_ERROR,
- "Client socket number too high to use select(): %d >= %d",
- afd, FD_SETSIZE);
- close_socket(afd);
- return 0;
- }
- #endif
- #endif
- #ifdef FEATURE_EXTERNAL_FILTERS
- mark_socket_for_close_on_execute(afd);
- #endif
- set_no_delay_flag(afd);
- csp->cfd = afd;
- #ifdef HAVE_RFC2553
- csp->ip_addr_str = malloc_or_die(NI_MAXHOST);
- retval = getnameinfo((struct sockaddr *) &client, c_length,
- csp->ip_addr_str, NI_MAXHOST, NULL, 0, NI_NUMERICHOST);
- if (!csp->ip_addr_str || retval)
- {
- log_error(LOG_LEVEL_ERROR, "Can not save csp->ip_addr_str: %s",
- (csp->ip_addr_str) ? gai_strerror(retval) : "Insuffcient memory");
- freez(csp->ip_addr_str);
- }
- #undef client
- #else
- csp->ip_addr_str = strdup(inet_ntoa(client.sin_addr));
- csp->ip_addr_long = ntohl(client.sin_addr.s_addr);
- #endif /* def HAVE_RFC2553 */
- /*
- * Save the name and port of the accepting socket for later lookup.
- *
- * The string needs space for strlen(...) + 7 characters:
- * strlen(haddr[i]) + 1 (':') + 5 (port digits) + 1 ('\0')
- */
- host_addr = (csp->config->haddr[i] != NULL) ? csp->config->haddr[i] : "";
- listen_addr_size = strlen(host_addr) + 7;
- csp->listen_addr_str = malloc_or_die(listen_addr_size);
- retval = snprintf(csp->listen_addr_str, listen_addr_size,
- "%s:%d", host_addr, csp->config->hport[i]);
- if ((-1 == retval) || listen_addr_size <= retval)
- {
- log_error(LOG_LEVEL_ERROR,
- "Server name (%s) and port number (%d) ASCII decimal representation"
- "don't fit into %lu bytes",
- host_addr, csp->config->hport[i], listen_addr_size);
- return 0;
- }
- return 1;
- }
- /*********************************************************************
- *
- * Function : resolve_hostname_to_ip
- *
- * Description : Resolve a hostname to an internet tcp/ip address.
- * NULL or an empty string resolve to INADDR_ANY.
- *
- * Parameters :
- * 1 : host = hostname to resolve
- *
- * Returns : INADDR_NONE => failure, INADDR_ANY or tcp/ip address if successful.
- *
- *********************************************************************/
- unsigned long resolve_hostname_to_ip(const char *host)
- {
- struct sockaddr_in inaddr;
- struct hostent *hostp;
- #if defined(HAVE_GETHOSTBYNAME_R_6_ARGS) || defined(HAVE_GETHOSTBYNAME_R_5_ARGS) || defined(HAVE_GETHOSTBYNAME_R_3_ARGS)
- struct hostent result;
- #if defined(HAVE_GETHOSTBYNAME_R_6_ARGS) || defined(HAVE_GETHOSTBYNAME_R_5_ARGS)
- char hbuf[HOSTENT_BUFFER_SIZE];
- int thd_err;
- #else /* defined(HAVE_GETHOSTBYNAME_R_3_ARGS) */
- struct hostent_data hdata;
- #endif /* def HAVE_GETHOSTBYNAME_R_(6|5)_ARGS */
- #endif /* def HAVE_GETHOSTBYNAME_R_(6|5|3)_ARGS */
- if ((host == NULL) || (*host == '\0'))
- {
- return(INADDR_ANY);
- }
- memset((char *) &inaddr, 0, sizeof inaddr);
- if ((inaddr.sin_addr.s_addr = inet_addr(host)) == -1)
- {
- unsigned int dns_retries = 0;
- #if defined(HAVE_GETHOSTBYNAME_R_6_ARGS)
- while (gethostbyname_r(host, &result, hbuf,
- HOSTENT_BUFFER_SIZE, &hostp, &thd_err)
- && (thd_err == TRY_AGAIN) && (dns_retries++ < MAX_DNS_RETRIES))
- {
- log_error(LOG_LEVEL_ERROR,
- "Timeout #%u while trying to resolve %s. Trying again.",
- dns_retries, host);
- }
- #elif defined(HAVE_GETHOSTBYNAME_R_5_ARGS)
- while (NULL == (hostp = gethostbyname_r(host, &result,
- hbuf, HOSTENT_BUFFER_SIZE, &thd_err))
- && (thd_err == TRY_AGAIN) && (dns_retries++ < MAX_DNS_RETRIES))
- {
- log_error(LOG_LEVEL_ERROR,
- "Timeout #%u while trying to resolve %s. Trying again.",
- dns_retries, host);
- }
- #elif defined(HAVE_GETHOSTBYNAME_R_3_ARGS)
- /*
- * XXX: Doesn't retry in case of soft errors.
- * Does this gethostbyname_r version set h_errno?
- */
- if (0 == gethostbyname_r(host, &result, &hdata))
- {
- hostp = &result;
- }
- else
- {
- hostp = NULL;
- }
- #elif defined(MUTEX_LOCKS_AVAILABLE)
- privoxy_mutex_lock(&resolver_mutex);
- while (NULL == (hostp = gethostbyname(host))
- && (h_errno == TRY_AGAIN) && (dns_retries++ < MAX_DNS_RETRIES))
- {
- log_error(LOG_LEVEL_ERROR,
- "Timeout #%u while trying to resolve %s. Trying again.",
- dns_retries, host);
- }
- privoxy_mutex_unlock(&resolver_mutex);
- #else
- while (NULL == (hostp = gethostbyname(host))
- && (h_errno == TRY_AGAIN) && (dns_retries++ < MAX_DNS_RETRIES))
- {
- log_error(LOG_LEVEL_ERROR,
- "Timeout #%u while trying to resolve %s. Trying again.",
- dns_retries, host);
- }
- #endif /* def HAVE_GETHOSTBYNAME_R_(6|5|3)_ARGS */
- /*
- * On Mac OSX, if a domain exists but doesn't have a type A
- * record associated with it, the h_addr member of the struct
- * hostent returned by gethostbyname is NULL, even if h_length
- * is 4. Therefore the second test below.
- */
- if (hostp == NULL || hostp->h_addr == NULL)
- {
- errno = EINVAL;
- log_error(LOG_LEVEL_ERROR, "could not resolve hostname %s", host);
- return(INADDR_NONE);
- }
- if (hostp->h_addrtype != AF_INET)
- {
- #ifdef _WIN32
- errno = WSAEPROTOTYPE;
- #else
- errno = EPROTOTYPE;
- #endif
- log_error(LOG_LEVEL_ERROR, "hostname %s resolves to unknown address type.", host);
- return(INADDR_NONE);
- }
- memcpy((char *)&inaddr.sin_addr, (char *)hostp->h_addr, sizeof(inaddr.sin_addr));
- }
- return(inaddr.sin_addr.s_addr);
- }
- /*********************************************************************
- *
- * Function : socket_is_still_alive
- *
- * Description : Figures out whether or not a socket is still alive.
- *
- * Parameters :
- * 1 : sfd = The socket to check.
- *
- * Returns : TRUE for yes, otherwise FALSE.
- *
- *********************************************************************/
- int socket_is_still_alive(jb_socket sfd)
- {
- char buf[10];
- int no_data_waiting;
- #ifdef HAVE_POLL
- int poll_result;
- struct pollfd poll_fd[1];
- memset(poll_fd, 0, sizeof(poll_fd));
- poll_fd[0].fd = sfd;
- poll_fd[0].events = POLLIN;
- poll_result = poll(poll_fd, 1, 0);
- if (-1 == poll_result)
- {
- log_error(LOG_LEVEL_CONNECT, "Polling socket %d failed.", sfd);
- return FALSE;
- }
- no_data_waiting = !(poll_fd[0].revents & POLLIN);
- #else
- fd_set readable_fds;
- struct timeval timeout;
- int ret;
- memset(&timeout, '\0', sizeof(timeout));
- FD_ZERO(&readable_fds);
- FD_SET(sfd, &readable_fds);
- ret = select((int)sfd+1, &readable_fds, NULL, NULL, &timeout);
- if (ret < 0)
- {
- log_error(LOG_LEVEL_CONNECT, "select() on socket %d failed: %E", sfd);
- return FALSE;
- }
- no_data_waiting = !FD_ISSET(sfd, &readable_fds);
- #endif /* def HAVE_POLL */
- return (no_data_waiting || (1 == recv(sfd, buf, 1, MSG_PEEK)));
- }
- #ifdef FEATURE_EXTERNAL_FILTERS
- /*********************************************************************
- *
- * Function : mark_socket_for_close_on_execute
- *
- * Description : Marks a socket for close on execute.
- *
- * Used so that external filters have no direct
- * access to sockets they shouldn't care about.
- *
- * Not implemented for all platforms.
- *
- * Parameters :
- * 1 : fd = The socket to mark
- *
- * Returns : void.
- *
- *********************************************************************/
- void mark_socket_for_close_on_execute(jb_socket fd)
- {
- #ifdef FEATURE_PTHREAD
- int ret;
- ret = fcntl(fd, F_SETFD, FD_CLOEXEC);
- if (ret == -1)
- {
- log_error(LOG_LEVEL_ERROR,
- "fcntl(%d, F_SETFD, FD_CLOEXEC) failed", fd);
- }
- #else
- #warning "Sockets will be visible to external filters"
- #endif
- }
- #endif /* def FEATURE_EXTERNAL_FILTERS */
- /*
- Local Variables:
- tab-width: 3
- end:
- */
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