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- /*
- * 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. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. 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.
- */
-
- #ifndef lint
- static char sccsid[] = "@(#)invite.c 8.1 (Berkeley) 6/6/93";
- #endif /* not lint */
-
- #ifdef HAVE_CONFIG_H
- #include <config.h>
- #endif
-
- #include <sys/types.h>
- #include <sys/socket.h>
- #include <sys/time.h>
- #include <signal.h>
- #include <netinet/in.h>
- #ifndef HAVE_OSOCKADDR
- #include <osockaddr.h>
- #endif
- #include <protocols/talkd.h>
- #include <errno.h>
- #include <setjmp.h>
- #include "talk_ctl.h"
- #include "talk.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.sa_family = htons (my_addr.sin_family);
- bcopy (msg.addr.sa_data,
- ((struct sockaddr *)&my_addr)->sa_data,
- sizeof ((struct sockaddr *)&my_addr)->sa_data);
-
- 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,
- (struct sockaddr *)&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,
- (struct sockaddr *)&daemon_addr,
- sizeof (daemon_addr)) != sizeof (msg))
- perror("send_delete (local)");
- }
-