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. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  * @(#)invite.c 8.1 (Berkeley) 6/6/93
  34  * $FreeBSD: src/usr.bin/talk/invite.c,v 1.6.2.1 2000/10/05 17:40:38 ru Exp $
  35  * $DragonFly: src/usr.bin/talk/invite.c,v 1.4 2004/08/19 23:32:02 joerg Exp $
  36  */
  37
  38 #include <sys/param.h>
  39 #include <sys/socket.h>
  40 #include <err.h>
  41 #include <errno.h>
  42 #include <setjmp.h>
  43 #include <signal.h>
  44 #include <protocols/talkd.h>
  45 #include "talk_ctl.h"
  46 #include "talk.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(void)
  65 {
  66         int nfd, read_mask, template, 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 osockaddr *)&my_addr;  /* XXX new to old  style*/
  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 interupt timer to resend the invitation
  88          */
  89         end_msgs();
  90         setitimer(ITIMER_REAL, &itimer, NULL);
  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 interupt to re-invite the callee
 118  */
 119 /* ARGSUSED */
 120 void
 121 re_invite(int signo)
 122 {
 123
 124         message("Ringing your party again");
 125         waddch(my_win.x_win, '\n');
 126         if (current_line < my_win.x_nlines - 1)
 127                 current_line++;
 128         /* force a re-announce */
 129         msg.id_num = htonl(remote_id + 1);
 130         announce_invite();
 131         longjmp(invitebuf, 1);
 132 }
 133
 134 static  char *answers[] = {
 135         "answer #0",                                    /* SUCCESS */
 136         "Your party is not logged on",                  /* NOT_HERE */
 137         "Target machine is too confused to talk to us", /* FAILED */
 138         "Target machine does not recognize us",         /* MACHINE_UNKNOWN */
 139         "Your party is refusing messages",              /* PERMISSION_REFUSED */
 140         "Target machine can not handle remote talk",    /* UNKNOWN_REQUEST */
 141         "Target machine indicates protocol mismatch",   /* BADVERSION */
 142         "Target machine indicates protocol botch (addr)",/* BADADDR */
 143         "Target machine indicates protocol botch (ctl_addr)",/* BADCTLADDR */
 144 };
 145 #define NANSWERS        (sizeof (answers) / sizeof (answers[0]))
 146
 147 /*
 148  * Transmit the invitation and process the response
 149  */
 150 void
 151 announce_invite(void)
 152 {
 153         CTL_RESPONSE response;
 154
 155         current_state = "Trying to connect to your party's talk daemon";
 156         ctl_transact(his_machine_addr, msg, ANNOUNCE, &response);
 157         remote_id = response.id_num;
 158         if (response.answer != SUCCESS) {
 159                 if (response.answer < NANSWERS)
 160                         message(answers[response.answer]);
 161                 quit();
 162         }
 163         /* leave the actual invitation on my talk daemon */
 164         current_state = "Trying to connect to local talk daemon";
 165         ctl_transact(my_machine_addr, msg, LEAVE_INVITE, &response);
 166         local_id = response.id_num;
 167 }
 168
 169 /*
 170  * Tell the daemon to remove your invitation
 171  */
 172 void
 173 send_delete(void)
 174 {
 175
 176         msg.type = DELETE;
 177         /*
 178          * This is just a extra clean up, so just send it
 179          * and don't wait for an answer
 180          */
 181         msg.id_num = htonl(remote_id);
 182         daemon_addr.sin_addr = his_machine_addr;
 183         if (sendto(ctl_sockt, &msg, sizeof (msg), 0,
 184             (struct sockaddr *)&daemon_addr,
 185             sizeof (daemon_addr)) != sizeof(msg))
 186                 warn("send_delete (remote)");
 187         msg.id_num = htonl(local_id);
 188         daemon_addr.sin_addr = my_machine_addr;
 189         if (sendto(ctl_sockt, &msg, sizeof (msg), 0,
 190             (struct sockaddr *)&daemon_addr,
 191             sizeof (daemon_addr)) != sizeof (msg))
 192                 warn("send_delete (local)");
 193 }