usr.bin/talk/invite.c

   1 /*      $NetBSD: invite.c,v 1.7 2005/09/24 16:40:01 christos Exp $      */
   2
   3 /*
   4  * Copyright (c) 1983, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #include <sys/cdefs.h>
  33 #ifndef lint
  34 #if 0
  35 static char sccsid[] = "@(#)invite.c    8.1 (Berkeley) 6/6/93";
  36 #endif
  37 __RCSID("$NetBSD: invite.c,v 1.7 2005/09/24 16:40:01 christos Exp $");
  38 #endif /* not lint */
  39
  40 #include "talk.h"
  41 #include <sys/time.h>
  42 #include <signal.h>
  43 #include <errno.h>
  44 #include <setjmp.h>
  45 #include <unistd.h>
  46 #include "talk_ctl.h"
  47
  48 /*
  49  * There wasn't an invitation waiting, so send a request containing
  50  * our sockt address to the remote talk daemon so it can invite
  51  * him
  52  */
  53
  54 /*
  55  * The msg.id's for the invitations
  56  * on the local and remote machines.
  57  * These are used to delete the
  58  * invitations.
  59  */
  60 int     local_id, remote_id;
  61 jmp_buf invitebuf;
  62
  63 void
  64 invite_remote()
  65 {
  66         int new_sockt;
  67         struct itimerval itimer;
  68         CTL_RESPONSE response;
  69
  70         itimer.it_value.tv_sec = RING_WAIT;
  71         itimer.it_value.tv_usec = 0;
  72         itimer.it_interval = itimer.it_value;
  73         if (listen(sockt, 5) != 0)
  74                 p_error("Error on attempt to listen for caller");
  75 #ifdef MSG_EOR
  76         /* copy new style sockaddr to old, swap family (short in old) */
  77         msg.addr = *(struct talkd_sockaddr *)(void *)&my_addr;
  78         msg.addr.sa_family = htons(my_addr.sin_family);
  79 #else
  80         msg.addr = *(struct sockaddr *)&my_addr;
  81 #endif
  82         msg.id_num = htonl(-1);         /* an impossible id_num */
  83         invitation_waiting = 1;
  84         announce_invite();
  85         /*
  86          * Shut off the automatic messages for a while,
  87          * so we can use the interrupt timer to resend the invitation
  88          */
  89         end_msgs();
  90         setitimer(ITIMER_REAL, &itimer, (struct itimerval *)0);
  91         message("Waiting for your party to respond");
  92         signal(SIGALRM, re_invite);
  93         (void) setjmp(invitebuf);
  94         while ((new_sockt = accept(sockt, 0, 0)) < 0) {
  95                 if (errno == EINTR)
  96                         continue;
  97                 p_error("Unable to connect with your party");
  98         }
  99         close(sockt);
 100         sockt = new_sockt;
 101
 102         /*
 103          * Have the daemons delete the invitations now that we
 104          * have connected.
 105          */
 106         current_state = "Waiting for your party to respond";
 107         start_msgs();
 108
 109         msg.id_num = htonl(local_id);
 110         ctl_transact(my_machine_addr, msg, DELETE, &response);
 111         msg.id_num = htonl(remote_id);
 112         ctl_transact(his_machine_addr, msg, DELETE, &response);
 113         invitation_waiting = 0;
 114 }
 115
 116 /*
 117  * Routine called on interrupt to re-invite the callee
 118  */
 119 void
 120 re_invite(dummy)
 121         int dummy;
 122 {
 123
 124         message("Ringing your party again");
 125         current_line++;
 126         /* force a re-announce */
 127         msg.id_num = htonl(remote_id + 1);
 128         announce_invite();
 129         longjmp(invitebuf, 1);
 130 }
 131
 132 static  const char *answers[] = {
 133         "answer #0",                                    /* SUCCESS */
 134         "Your party is not logged on",                  /* NOT_HERE */
 135         "Target machine is too confused to talk to us", /* FAILED */
 136         "Target machine does not recognize us",         /* MACHINE_UNKNOWN */
 137         "Your party is refusing messages",              /* PERMISSION_REFUSED */
 138         "Target machine can not handle remote talk",    /* UNKNOWN_REQUEST */
 139         "Target machine indicates protocol mismatch",   /* BADVERSION */
 140         "Target machine indicates protocol botch (addr)",/* BADADDR */
 141         "Target machine indicates protocol botch (ctl_addr)",/* BADCTLADDR */
 142 };
 143 #define NANSWERS        (sizeof (answers) / sizeof (answers[0]))
 144
 145 /*
 146  * Transmit the invitation and process the response
 147  */
 148 void
 149 announce_invite()
 150 {
 151         CTL_RESPONSE response;
 152
 153         current_state = "Trying to connect to your party's talk daemon";
 154         ctl_transact(his_machine_addr, msg, ANNOUNCE, &response);
 155         remote_id = response.id_num;
 156         if (response.answer != SUCCESS) {
 157                 if (response.answer < NANSWERS)
 158                         message(answers[response.answer]);
 159                 quit();
 160         }
 161         /* leave the actual invitation on my talk daemon */
 162         ctl_transact(my_machine_addr, msg, LEAVE_INVITE, &response);
 163         local_id = response.id_num;
 164 }
 165
 166 /*
 167  * Tell the daemon to remove your invitation
 168  */
 169 void
 170 send_delete()
 171 {
 172
 173         msg.type = DELETE;
 174         /*
 175          * This is just a extra clean up, so just send it
 176          * and don't wait for an answer
 177          */
 178         msg.id_num = htonl(remote_id);
 179         daemon_addr.sin_addr = his_machine_addr;
 180         if (sendto(ctl_sockt, &msg, sizeof (msg), 0,
 181             (struct sockaddr *)&daemon_addr,
 182             sizeof (daemon_addr)) != sizeof(msg))
 183                 perror("send_delete (remote)");
 184         msg.id_num = htonl(local_id);
 185         daemon_addr.sin_addr = my_machine_addr;
 186         if (sendto(ctl_sockt, &msg, sizeof (msg), 0,
 187             (struct sockaddr *)&daemon_addr,
 188             sizeof (daemon_addr)) != sizeof (msg))
 189                 perror("send_delete (local)");
 190 }