/*
* Copyright (c) 1983, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* 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.
*/
static int local_id, remote_id;
static jmp_buf invitebuf;
void
invite_remote(void)
{
int 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");
#ifdef MSG_EOR
/* copy new style sockaddr to old, swap family (short in old) */
msg.addr = *(struct talkd_sockaddr *)(void *)&my_addr;
msg.addr.sa_family = htons(my_addr.sin_family);
#else
msg.addr = *(struct sockaddr *)&my_addr;
#endif
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 interrupt 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();
/*
* Routine called on interrupt to re-invite the callee
*/
void
re_invite(int dummy)
{
message("Ringing your party again");
current_line++;
/* force a re-announce */
msg.id_num = htonl(remote_id + 1);
announce_invite();
longjmp(invitebuf, 1);
}
static const 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
*/
void
announce_invite(void)
{
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
*/
void
send_delete(void)
{
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,
(struct sockaddr *)&daemon_addr,
sizeof (daemon_addr)) != sizeof(msg))
warn("send_delete (remote)");
msg.id_num = htonl(local_id);
daemon_addr.sin_addr = my_machine_addr;
if (sendto(ctl_sockt, &msg, sizeof (msg), 0,
(struct sockaddr *)&daemon_addr,
sizeof (daemon_addr)) != sizeof (msg))
warn("send_delete (local)");
}
