BSD 4_3_Net_1 release
[unix-history] / talk / invite.c
/*
* Copyright (c) 1983 Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that the above copyright notice and this paragraph are
* duplicated in all such forms and that any documentation,
* advertising materials, and other materials related to such
* distribution and use acknowledge that the software was developed
* by the University of California, Berkeley. The name of the
* University may not be used to endorse or promote products derived
* from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#ifndef lint
static char sccsid[] = "@(#)invite.c 5.5 (Berkeley) 6/29/88";
#endif /* not lint */
#include "talk_ctl.h"
#include <sys/time.h>
#include <signal.h>
#include <setjmp.h>
/*
* There wasn't an invitation waiting, so send a request containing
* our sockt address to the remote talk daemon so it can invite
* him
*/
/*
* The msg.id's for the invitations
* on the local and remote machines.
* These are used to delete the
* invitations.
*/
int local_id, remote_id;
void re_invite();
jmp_buf invitebuf;
invite_remote()
{
int nfd, read_mask, template, new_sockt;
struct itimerval itimer;
CTL_RESPONSE response;
itimer.it_value.tv_sec = RING_WAIT;
itimer.it_value.tv_usec = 0;
itimer.it_interval = itimer.it_value;
if (listen(sockt, 5) != 0)
p_error("Error on attempt to listen for caller");
msg.addr = *(struct sockaddr *)&my_addr;
msg.addr.sa_family = htons(msg.addr.sa_family);
msg.id_num = htonl(-1); /* an impossible id_num */
invitation_waiting = 1;
announce_invite();
/*
* Shut off the automatic messages for a while,
* so we can use the interupt timer to resend the invitation
*/
end_msgs();
setitimer(ITIMER_REAL, &itimer, (struct itimerval *)0);
message("Waiting for your party to respond");
signal(SIGALRM, re_invite);
(void) setjmp(invitebuf);
while ((new_sockt = accept(sockt, 0, 0)) < 0) {
if (errno == EINTR)
continue;
p_error("Unable to connect with your party");
}
close(sockt);
sockt = new_sockt;
/*
* Have the daemons delete the invitations now that we
* have connected.
*/
current_state = "Waiting for your party to respond";
start_msgs();
msg.id_num = htonl(local_id);
ctl_transact(my_machine_addr, msg, DELETE, &response);
msg.id_num = htonl(remote_id);
ctl_transact(his_machine_addr, msg, DELETE, &response);
invitation_waiting = 0;
}
/*
* Routine called on interupt to re-invite the callee
*/
void
re_invite()
{
message("Ringing your party again");
current_line++;
/* force a re-announce */
msg.id_num = htonl(remote_id + 1);
announce_invite();
longjmp(invitebuf, 1);
}
static char *answers[] = {
"answer #0", /* SUCCESS */
"Your party is not logged on", /* NOT_HERE */
"Target machine is too confused to talk to us", /* FAILED */
"Target machine does not recognize us", /* MACHINE_UNKNOWN */
"Your party is refusing messages", /* PERMISSION_REFUSED */
"Target machine can not handle remote talk", /* UNKNOWN_REQUEST */
"Target machine indicates protocol mismatch", /* BADVERSION */
"Target machine indicates protocol botch (addr)",/* BADADDR */
"Target machine indicates protocol botch (ctl_addr)",/* BADCTLADDR */
};
#define NANSWERS (sizeof (answers) / sizeof (answers[0]))
/*
* Transmit the invitation and process the response
*/
announce_invite()
{
CTL_RESPONSE response;
current_state = "Trying to connect to your party's talk daemon";
ctl_transact(his_machine_addr, msg, ANNOUNCE, &response);
remote_id = response.id_num;
if (response.answer != SUCCESS) {
if (response.answer < NANSWERS)
message(answers[response.answer]);
quit();
}
/* leave the actual invitation on my talk daemon */
ctl_transact(my_machine_addr, msg, LEAVE_INVITE, &response);
local_id = response.id_num;
}
/*
* Tell the daemon to remove your invitation
*/
send_delete()
{
msg.type = DELETE;
/*
* This is just a extra clean up, so just send it
* and don't wait for an answer
*/
msg.id_num = htonl(remote_id);
daemon_addr.sin_addr = his_machine_addr;
if (sendto(ctl_sockt, &msg, sizeof (msg), 0, &daemon_addr,
sizeof (daemon_addr)) != sizeof(msg))
perror("send_delete (remote)");
msg.id_num = htonl(local_id);
daemon_addr.sin_addr = my_machine_addr;
if (sendto(ctl_sockt, &msg, sizeof (msg), 0, &daemon_addr,
sizeof (daemon_addr)) != sizeof (msg))
perror("send_delete (local)");
}