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jbsockets.c
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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) 2001-2022 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>
#ifdef socklen_t
#undef socklen_t
#endif
#include <ws2tcpip.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