usr.bin/talk/invite.c

   1 /*
   2  * Copyright (c) 1983, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * @(#)invite.c 8.1 (Berkeley) 6/6/93
  30  * $FreeBSD: src/usr.bin/talk/invite.c,v 1.6.2.1 2000/10/05 17:40:38 ru Exp $
  31  */
  32
  33 #include <sys/param.h>
  34 #include <sys/socket.h>
  35 #include <err.h>
  36 #include <errno.h>
  37 #include <setjmp.h>
  38 #include <signal.h>
  39 #include <protocols/talkd.h>
  40 #include "talk_ctl.h"
  41 #include "talk.h"
  42
  43 /*
  44  * There wasn't an invitation waiting, so send a request containing
  45  * our sockt address to the remote talk daemon so it can invite
  46  * him
  47  */
  48
  49 /*
  50  * The msg.id's for the invitations
  51  * on the local and remote machines.
  52  * These are used to delete the
  53  * invitations.
  54  */
  55 int     local_id, remote_id;
  56 jmp_buf invitebuf;
  57
  58 void
  59 invite_remote(void)
  60 {
  61         int new_sockt;
  62         struct itimerval itimer;
  63         CTL_RESPONSE response;
  64
  65         itimer.it_value.tv_sec = RING_WAIT;
  66         itimer.it_value.tv_usec = 0;
  67         itimer.it_interval = itimer.it_value;
  68         if (listen(sockt, 5) != 0)
  69                 p_error("Error on attempt to listen for caller");
  70 #ifdef MSG_EOR
  71         /* copy new style sockaddr to old, swap family (short in old) */
  72         msg.addr = *(struct osockaddr *)&my_addr;  /* XXX new to old  style*/
  73         msg.addr.sa_family = htons(my_addr.sin_family);
  74 #else
  75         msg.addr = *(struct sockaddr *)&my_addr;
  76 #endif
  77         msg.id_num = htonl(-1);         /* an impossible id_num */
  78         invitation_waiting = 1;
  79         announce_invite();
  80         /*
  81          * Shut off the automatic messages for a while,
  82          * so we can use the interupt timer to resend the invitation
  83          */
  84         end_msgs();
  85         setitimer(ITIMER_REAL, &itimer, NULL);
  86         message("Waiting for your party to respond");
  87         signal(SIGALRM, re_invite);
  88         (void) setjmp(invitebuf);
  89         while ((new_sockt = accept(sockt, 0, 0)) < 0) {
  90                 if (errno == EINTR)
  91                         continue;
  92                 p_error("Unable to connect with your party");
  93         }
  94         close(sockt);
  95         sockt = new_sockt;
  96
  97         /*
  98          * Have the daemons delete the invitations now that we
  99          * have connected.
 100          */
 101         current_state = "Waiting for your party to respond";
 102         start_msgs();
 103
 104         msg.id_num = htonl(local_id);
 105         ctl_transact(my_machine_addr, msg, DELETE, &response);
 106         msg.id_num = htonl(remote_id);
 107         ctl_transact(his_machine_addr, msg, DELETE, &response);
 108         invitation_waiting = 0;
 109 }
 110
 111 /*
 112  * Routine called on interupt to re-invite the callee
 113  */
 114 /* ARGSUSED */
 115 void
 116 re_invite(int signo __unused)
 117 {
 118
 119         message("Ringing your party again");
 120         waddch(my_win.x_win, '\n');
 121         if (current_line < my_win.x_nlines - 1)
 122                 current_line++;
 123         /* force a re-announce */
 124         msg.id_num = htonl(remote_id + 1);
 125         announce_invite();
 126         longjmp(invitebuf, 1);
 127 }
 128
 129 static  const char *answers[] = {
 130         "answer #0",                                    /* SUCCESS */
 131         "Your party is not logged on",                  /* NOT_HERE */
 132         "Target machine is too confused to talk to us", /* FAILED */
 133         "Target machine does not recognize us",         /* MACHINE_UNKNOWN */
 134         "Your party is refusing messages",              /* PERMISSION_REFUSED */
 135         "Target machine can not handle remote talk",    /* UNKNOWN_REQUEST */
 136         "Target machine indicates protocol mismatch",   /* BADVERSION */
 137         "Target machine indicates protocol botch (addr)",/* BADADDR */
 138         "Target machine indicates protocol botch (ctl_addr)",/* BADCTLADDR */
 139 };
 140 #define NANSWERS        (sizeof (answers) / sizeof (answers[0]))
 141
 142 /*
 143  * Transmit the invitation and process the response
 144  */
 145 void
 146 announce_invite(void)
 147 {
 148         CTL_RESPONSE response;
 149
 150         current_state = "Trying to connect to your party's talk daemon";
 151         ctl_transact(his_machine_addr, msg, ANNOUNCE, &response);
 152         remote_id = response.id_num;
 153         if (response.answer != SUCCESS) {
 154                 if (response.answer < NANSWERS)
 155                         message(answers[response.answer]);
 156                 quit();
 157         }
 158         /* leave the actual invitation on my talk daemon */
 159         current_state = "Trying to connect to local talk daemon";
 160         ctl_transact(my_machine_addr, msg, LEAVE_INVITE, &response);
 161         local_id = response.id_num;
 162 }
 163
 164 /*
 165  * Tell the daemon to remove your invitation
 166  */
 167 void
 168 send_delete(void)
 169 {
 170
 171         msg.type = DELETE;
 172         /*
 173          * This is just a extra clean up, so just send it
 174          * and don't wait for an answer
 175          */
 176         msg.id_num = htonl(remote_id);
 177         daemon_addr.sin_addr = his_machine_addr;
 178         if (sendto(ctl_sockt, &msg, sizeof (msg), 0,
 179             (struct sockaddr *)&daemon_addr,
 180             sizeof (daemon_addr)) != sizeof(msg))
 181                 warn("send_delete (remote)");
 182         msg.id_num = htonl(local_id);
 183         daemon_addr.sin_addr = my_machine_addr;
 184         if (sendto(ctl_sockt, &msg, sizeof (msg), 0,
 185             (struct sockaddr *)&daemon_addr,
 186             sizeof (daemon_addr)) != sizeof (msg))
 187                 warn("send_delete (local)");
 188 }