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#ifndef lint
static char SccsId[] = "%W% %G%";
#endif
/* Module: ctrlsckt.c (Control Socket)
* Purpose: Open a pipe device for IO
* Subroutine: open_socket_listener() returns: int
* Subroutine: accept_socket_connection() returns: struct *connectRec
* Subroutine: close_socket() returns: void
* Subroutine: flush_socket() returns: void
* Copyright: 1990 Smithsonian Astrophysical Observatory
* You may do anything you like with this file except remove
* this copyright. The Smithsonian Astrophysical Observatory
* makes no representations about the suitability of this
* software for any purpose. It is provided "as is" without
* express or implied warranty.
* Modified: {0} John Roll initial version 1 March 1990
* {1} MVH simplified for new connect module 10 March 1990
* {n} <who> -- <does what> -- <when>
*/
#ifndef VMS
#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h> /* socket(), bind(), listen(), accept(), etc */
#include <netdb.h>
#include <netinet/in.h> /* htonl(), struct sockaddr_in */
#ifdef SYSV
#include <string.h> /* strlen(), strcpy(), strncpy(), strrchr() */
#else
#include <strings.h> /* strlen(), strcpy(), strncpy(), rindex() */
#endif
#include <X11/Xlib.h> /* X window stuff */
#include "hfiles/control.h" /* define struct connectRec */
/*
* Subroutine: open_socket_listener
* Purpose: Get a socket on which to listen for connections
*/
int open_socket_listener ( host_name, port_address )
char **host_name;
int port_address;
{
struct hostent *host_port;
struct sockaddr_in net_address;
int ipc;
static char *local_name;
char *calloc_errchk();
bzero(&net_address, sizeof(net_address));
/* if host name not given, use the local host name of this machine */
if( *host_name == NULL ) {
/* if local host name not yet known, get it and remember it */
if( local_name == NULL ) {
char name[100];
if( gethostname(name, 100) != 0 ) {
perror("Can't get user's hostname for socket\n ");
return( -1 );
}
local_name = calloc_errchk(strlen(name)+2, 1, "socket host name");
(void)strncpy(local_name, name, 100);
}
*host_name = local_name;
}
/* get host port address information */
if( (host_port = gethostbyname(*host_name)) == NULL ) {
(void)fprintf(stderr, "Unknown host for socket: %d on %s\n",
port_address, *host_name);
return( -1 );
}
/* fill in the network address structure */
net_address.sin_family = AF_INET;
/* convert port address from host to network byte order */
net_address.sin_port = htonl(port_address);
bcopy(host_port->h_addr, &(net_address.sin_addr),
sizeof(net_address.sin_addr));
/* create a socket communication endpoint */
/* use full-duplex byte stream & ARPA Internet protocol */
if( (ipc = socket(PF_INET, SOCK_STREAM, 0)) < 0 ) {
perror("Cannot create a socket connection\n ");
return( -1 );
}
/* bind the socket to the network address */
if( bind(ipc, &net_address, sizeof(net_address)) ) {
perror("cannot bind socket to host address\n ");
return( -1 );
}
/* start listening for connections (allowing a backlog of 5) */
if( listen(ipc, 5) ) {
perror("Cannot listen on socket\n ");
return( -1 );
}
return( ipc );
}
/*
* Subroutine: accept_socket_connection
* Purpose: accept a connection requested of the socket listener
*/
struct connectRec *accept_socket_connection ( listener )
struct connectRec *listener;
{
struct sockaddr net_address;
int ipc;
int address_len;
struct connectRec *connection;
char *calloc_errchk();
address_len = sizeof(net_address);
if( (ipc = accept(listener->fd, &net_address, &address_len)) < 0 ) {
perror("Cannot accept socket connection");
return( NULL );
}
connection = (struct connectRec *)
calloc_errchk(1, sizeof(struct connectRec), "socket descriptor");
connection->fd = ipc;
connection->type = IOP_socket;
connection->direction = listener->direction;
connection->protocol = listener->protocol;
connection->func = listener->func;
connection->name = listener->name;
connection->address = listener->address;
connection->affiliate = listener;
listener->affiliate = connection;
return( connection );
}
/*
* Subroutine: flush_socket
* Purpose: flush all pending input on this socket connection
*/
void flush_socket ( ipc, socketname )
int ipc;
char *socketname;
{
extern void flush_disk();
if( socketname == NULL )
flush_disk(ipc, "socket");
else
flush_disk(ipc, socketname);
}
/*
* Subroutine: close_socket
* Purpose: close this socket's file descriptor
*/
void close_socket ( ipc )
int ipc;
{
if( close(ipc) )
perror("Error closing socket\n ");
}
#endif
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