home *** CD-ROM | disk | FTP | other *** search
- # Setting up a connection to an X server
- # Bruno Haible 19.6.1994
-
- # This code comes from the X11R5 distribution, file mit/X/XConnDis.c,
- # with the following modifications:
- # - no support for DNETCONN or STREAMSCONN,
- # - display name has already been split into hostname and display number,
- # - doesn't return full host&display name and auth info,
- # - doesn't depend on the X include files.
-
- # mit/X/XConnDis.c carries the following copyright notice:
- /*
- * $XConsortium: XConnDis.c,v 11.85 91/07/19 23:07:39 gildea Exp $
- *
- * Copyright 1989 Massachusetts Institute of Technology
- *
- * Permission to use, copy, modify, and distribute this software and its
- * documentation for any purpose and without fee is hereby granted, provided
- * that the above copyright notice appear in all copies and that both that
- * copyright notice and this permission notice appear in supporting
- * documentation, and that the name of M.I.T. not be used in advertising
- * or publicity pertaining to distribution of the software without specific,
- * written prior permission. M.I.T. makes no representations about the
- * suitability of this software for any purpose. It is provided "as is"
- * without express or implied warranty.
- *
- * M.I.T. DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL M.I.T.
- * BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
- * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
- * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
- *
- *
- * This file contains operating system dependencies.
- */
-
- # These are the only things we need from lispbibl.c :
- #include "unixconf.h"
- #define global
- #define var
-
- # We assume that if we have gethostbyname(), we have a networking Unix.
- # and have either UNIX domain connections or TCP/IP connections.
- #ifdef HAVE_GETHOSTBYNAME
-
- #ifdef HAVE_SYS_UN_H # have <sys/un.h> and Unix domain sockets?
- #define UNIXCONN # use Unix domain sockets
- #endif
- #ifdef HAVE_NETINET_IN_H # have <netinet/in.h> ?
- #define TCPCONN # use TCP/IP sockets
- #endif
-
- #include <sys/types.h>
- #ifdef HAVE_UNISTD_H
- #include <unistd.h> # declares fcntl(), close(), sleep()
- #endif
-
- #include <errno.h>
- extern int errno;
- #ifndef ENOSYS
- #define ENOSYS EINVAL
- #endif
-
- #include <fcntl.h> # declares fcntl() and defines F_SETFD
- #ifdef FCNTL_DOTS
- extern int fcntl (int fd, int cmd, ...);
- #else
- extern int fcntl (int fd, int cmd, int arg);
- #endif
- #ifndef FD_CLOEXEC
- #define FD_CLOEXEC 1
- #endif
-
- extern int close (int fd);
- #define CLOSE(fd) while ((close(fd) < 0) && (errno == EINTR)) ;
-
- #if defined(UNIXCONN) || defined(TCPCONN)
-
- # include <sys/types.h>
- #include <sys/socket.h> # declares socket(), connect(), defines AF_UNIX, AF_INET
- extern int socket (int domain, int type, int protocol);
- extern int connect (int fd, CONNECT_CONST CONNECT_NAME_T name, int namelen);
-
- # A wrapper around the connect() function.
- global int nonintr_connect (int fd, struct sockaddr * name, int namelen);
- global int nonintr_connect(fd,name,namelen)
- var int fd;
- var struct sockaddr * name;
- var int namelen;
- { var int retval;
- do { retval = connect(fd,name,namelen); }
- while ((retval < 0) && (errno == EINTR));
- return retval;
- }
- #define connect nonintr_connect
-
- extern unsigned int sleep (unsigned int seconds);
-
- #endif
-
- #ifdef UNIXCONN
- #include <stdio.h> # declares sprintf()
- #include <string.h> # declares strcmp(), strlen()
- #ifdef RETSTRLENTYPE /* unless strlen() is a macro */
- extern RETSTRLENTYPE strlen (STRLEN_CONST char* s);
- #endif
- #include <sys/un.h> # defines struct sockaddr_un
- # set X_UNIX_PATH and - on hpux only - OLD_UNIX_PATH
- #ifndef X_UNIX_PATH
- #ifndef hpux
- #define X_UNIX_PATH "/tmp/.X11-unix/X"
- #else
- #define X_UNIX_PATH "/usr/spool/sockets/X11/"
- #define OLD_UNIX_PATH "/tmp/.X11-unix/X"
- #endif
- #endif
- #endif
-
- #ifdef TCPCONN
- #ifdef HAVE_GETHOSTNAME
- extern int gethostname (char* name, GETHOSTNAME_SIZE_T namelen);
- #endif
- #ifdef HAVE_SYS_UTSNAME_H
- #include <sys/utsname.h>
- extern int uname (struct utsname * buf);
- #endif
- #ifdef HAVE_GETHOSTBYNAME
- #include <sys/types.h>
- #ifdef HAVE_NETDB_H
- # include <sys/socket.h>
- #include <netdb.h>
- #else
- #include <sun/netdb.h>
- #endif
- extern struct hostent * gethostbyname (GETHOSTBYNAME_CONST char* name);
- #endif
- #ifndef MAXHOSTNAMELEN
- #define MAXHOSTNAMELEN 64
- #endif
- #include <netinet/in.h> # declares htons(), defines struct sockaddr_in
- #ifdef HAVE_ARPA_INET_H
- #include <arpa/inet.h> # declares inet_addr()
- #endif
- extern RET_INET_ADDR_TYPE inet_addr (INET_ADDR_CONST char* host);
- #ifdef HAVE_NETINET_TCP_H
- #if defined(__386BSD__) || defined(__NetBSD__)
- #include <machine/endian.h> # needed for <netinet/tcp.h>
- #endif
- #include <netinet/tcp.h> # declares TCP_NODELAY
- #endif
- extern int setsockopt (/* int fd, int level, int optname, char* optval, int optlen */);
- #define X_TCP_PORT 6000 # from <X11/Xproto.h>
- #endif
-
- # Attempts to connect to server, given host name and display number.
- # Returns file descriptor (network socket). Returns -1 and sets errbo
- # if connection fails.
- # An empty hostname is interpreted as the most efficient local connection to
- # a server on the same machine (usually a UNIX domain socket).
- # hostname="unix" is interpreted as a UNIX domain connection.
-
- global int connect_to_server (char* host, int display);
- global int connect_to_server(host,display)
- var char* host; # host of display
- var int display; # display number (screen number always zero)
- { var int fd; # file descriptor to return
- var int retries = 3; # number of retries on ECONNREFUSED
-
- var int conntype; # type of desired connection
- #define conn_none 0
- #define conn_unix 1
- #define conn_tcp 2
- #ifdef TCPCONN
- conntype = conn_tcp;
- #else
- conntype = conn_none;
- #endif
- #ifdef UNIXCONN
- if (host[0] == '\0')
- {
- #ifndef apollo # Unix domain sockets are *really* bad on apollos
- conntype = conn_unix;
- #endif
- }
- else if (strcmp(host,"unix")==0)
- { conntype = conn_unix; }
- #endif
-
- # Make the connection. Do retries in case server host has hit its
- # backlog (which, unfortunately, isn't distinguishable from there not
- # being a server listening at all, which is why we have to not retry
- # too many times).
-
- #ifdef UNIXCONN
- if (conntype == conn_unix)
- {
- var struct sockaddr_un unaddr; # UNIX socket data block
- var struct sockaddr * addr; # generic socket pointer
- var int addrlen; # length of addr
- #ifdef hpux /* this is disgusting */
- var struct sockaddr_un ounaddr; # UNIX socket data block
- var struct sockaddr * oaddr; # generic socket pointer
- var int oaddrlen; # length of addr
- #endif
-
- unaddr.sun_family = AF_UNIX;
- sprintf (unaddr.sun_path, "%s%d", X_UNIX_PATH, display);
- addr = (struct sockaddr *) &unaddr;
- #ifdef HAVE_SOCKADDR_UN_LEN /* this is AIX */
- unaddr.sun_len = strlen(unaddr.sun_path); addrlen = sizeof(unaddr);
- #else
- addrlen = strlen(unaddr.sun_path) + sizeof(unaddr.sun_family);
- #endif
- #ifdef hpux /* this is disgusting */
- ounaddr.sun_family = AF_UNIX;
- sprintf (ounaddr.sun_path, "%s%d", OLD_UNIX_PATH, display);
- oaddr = (struct sockaddr *) &ounaddr;
- #ifdef HAVE_SOCKADDR_UN_LEN /* this is AIX */
- ounaddr.sun_len = strlen(ounaddr.sun_path); oaddrlen = sizeof(ounaddr);
- #else
- oaddrlen = strlen(ounaddr.sun_path) + sizeof(ounaddr.sun_family);
- #endif
- #endif
-
- # Open the network connection.
- do { if ((fd = socket((int) addr->sa_family, SOCK_STREAM, 0)) >= 0)
- { if (connect (fd, addr, addrlen) >= 0)
- break;
- else
- { int olderrno = errno; CLOSE(fd); errno = olderrno; }
- }
- #ifdef hpux /* this is disgusting */
- if (errno == ENOENT)
- { if ((fd = socket((int) oaddr->sa_family, SOCK_STREAM, 0)) >= 0)
- { if (connect (fd, oaddr, oaddrlen) >= 0)
- break;
- else
- { int olderrno = errno; CLOSE(fd); errno = olderrno; }
- } }
- #endif
- if (!((errno == ENOENT) && (retries > 0)))
- { return -1; }
- sleep (1);
- }
- while (retries-- > 0);
- }
- else
- #endif
-
- #ifdef TCPCONN
- if (conntype == conn_tcp)
- {
- #if defined(HAVE_GETHOSTNAME)
- var char hostname[MAXHOSTNAMELEN+1];
- #elif defined(HAVE_SYS_UTSNAME_H)
- var struct utsname utsname;
- #endif
- var unsigned long hostinetaddr; # result of inet_addr of arpa addr
- var struct sockaddr_in inaddr; # IP socket
- var struct sockaddr * addr; # generic socket pointer
- var int addrlen; # length of addr
- if (host[0] == '\0')
- { # get host name
- #if defined(HAVE_GETHOSTNAME)
- if (gethostname(&!hostname,MAXHOSTNAMELEN) < 0) { return -1; }
- hostname[MAXHOSTNAMELEN] = '\0';
- host = &!hostname;
- #elif defined(HAVE_SYS_UTSNAME_H)
- if (uname(&utsname) < 0) { return -1; }
- host = &!utsname.nodename;
- #else
- ??
- #endif
- }
- # if numeric host name then try to parse it as such; do the number
- # first because some systems return garbage instead of INVALID_INETADDR
- #define INVALID_INETADDR ((unsigned long) -1)
- if ((host[0] >= '0') && (host[0] <= '9'))
- { hostinetaddr = inet_addr(host) INET_ADDR_SUFFIX ; }
- else
- { hostinetaddr = INVALID_INETADDR; }
- # try numeric
- if (hostinetaddr == INVALID_INETADDR)
- { var struct hostent * host_ptr; # entry in hosts table
- if ((host_ptr = gethostbyname(host)) == NULL)
- { errno = EINVAL; return -1; } # No such host!
- # Check the address type for an internet host.
- if (host_ptr->h_addrtype != AF_INET)
- { errno = EPROTOTYPE; return -1; } # Not an Internet host!
- # Set up the socket data.
- inaddr.sin_family = host_ptr->h_addrtype;
- inaddr.sin_addr = *(struct in_addr *)host_ptr->h_addr;
- }
- else
- { inaddr.sin_family = AF_INET;
- inaddr.sin_addr.s_addr = hostinetaddr;
- }
-
- inaddr.sin_port = X_TCP_PORT + display;
- inaddr.sin_port = htons(inaddr.sin_port);
- addr = (struct sockaddr *) &inaddr;
- addrlen = sizeof(struct sockaddr_in);
-
- # Open the network connection.
- do { if ((fd = socket ((int) addr->sa_family, SOCK_STREAM, 0)) < 0)
- { return -1; }
- #ifdef TCP_NODELAY
- # turn off TCP coalescence
- { int tmp = 1;
- setsockopt (fd, IPPROTO_TCP, TCP_NODELAY, &tmp, sizeof(int));
- }
- #endif
- # Connect to the socket.
- # If there is no X server or if the backlog has been reached,
- # then ECONNREFUSED will be returned.
- if (connect (fd, addr, addrlen) >= 0)
- break;
- { int olderrno = errno; CLOSE(fd); errno = olderrno; }
- if (!((errno == ECONNREFUSED) && (retries > 0)))
- { return -1; }
- sleep (1);
- }
- while (retries-- > 0);
- }
- else
- #endif
-
- # (conntype == conn_none)
- { errno = ENOSYS; return -1; }
-
- # Set close-on-exec so that we won't get confused if we fork().
- fcntl(fd,F_SETFD,FD_CLOEXEC);
-
- return fd;
- }
-
- #endif # HAVE_GETHOSTBYNAME
-
-