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NETPROG.TAR
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lib
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idpopen.c
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C/C++ Source or Header
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1989-12-17
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2KB
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82 lines
/*
* Establish an IDP socket and optionally call connect() to set up
* the server's address for future I/O.
*/
#include "netdefs.h"
#include <netns/ns.h>
/*
* The following globals are available to the caller, if desired.
*/
struct sockaddr_ns idp_srv_addr; /* server's XNS socket addr */
struct sockaddr_ns idp_cli_addr; /* client's XNS socket addr */
int /* return socket descriptor if OK, else -1 on error */
idp_open(host, service, port, dontconn)
char *host; /* name of other system to communicate with */
/* must be acceptable to ns_addr(3N) */
/* <netid><separator><hostid><separator><port> */
char *service; /* name of service being requested */
/* not currently used */
int port; /* if < 0, bind a local reserved port (TODO) */
/* if > 0, it's the port# of server */
int dontconn; /* if == 0, call connect(), else don't */
{
int fd;
struct ns_addr ns_addr(); /* BSD library routine */
/*
* Create an IDP socket.
*/
if ( (fd = socket(AF_NS, SOCK_DGRAM, 0)) < 0) {
err_ret("idp_open: can't create IDP datagram socket");
return(-1);
}
/*
* Bind any local address for us.
*/
bzero((char *) &idp_cli_addr, sizeof(idp_cli_addr));
idp_cli_addr.sns_family = AF_NS;
if (bind(fd, (struct sockaddr *) &idp_cli_addr,
sizeof(idp_cli_addr)) < 0) {
err_ret("idp_open: bind error");
close(fd);
return(-1);
}
/*
* Set up the server's address.
*/
bzero((char *) &idp_srv_addr, sizeof(idp_srv_addr));
idp_srv_addr.sns_family = AF_NS;
idp_srv_addr.sns_addr = ns_addr(host);
/* stores net-ID, host-ID and port */
if (port > 0)
idp_srv_addr.sns_addr.x_port = htons(port);
else if (port < 0)
err_quit("idp_open: reserved ports not implemeneted yet");
/*
* Call connect, if desired. This is used by most caller's,
* as the peer shouldn't change.
* By calling connect, the caller can call send() and recv().
*/
if (dontconn == 0) {
if (connect(fd, (struct sockaddr *) &idp_srv_addr,
sizeof(idp_srv_addr)) < 0) {
err_ret("idp_open: connect error");
return(-1);
}
}
return(fd);
}