talk.tproj/invite.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * "Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
   7  * Reserved.  This file contains Original Code and/or Modifications of
   8  * Original Code as defined in and that are subject to the Apple Public
   9  * Source License Version 1.0 (the 'License').  You may not use this file
  10  * except in compliance with the License.  Please obtain a copy of the
  11  * License at http://www.apple.com/publicsource and read it before using
  12  * this file.
  13  *
  14  * The Original Code and all software distributed under the License are
  15  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  16  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  17  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  19  * License for the specific language governing rights and limitations
  20  * under the License."
  21  *
  22  * @APPLE_LICENSE_HEADER_END@
  23  */
  24 /*
  25  * Copyright (c) 1983, 1993
  26  *      The Regents of the University of California.  All rights reserved.
  27  *
  28  * Redistribution and use in source and binary forms, with or without
  29  * modification, are permitted provided that the following conditions
  30  * are met:
  31  * 1. Redistributions of source code must retain the above copyright
  32  *    notice, this list of conditions and the following disclaimer.
  33  * 2. Redistributions in binary form must reproduce the above copyright
  34  *    notice, this list of conditions and the following disclaimer in the
  35  *    documentation and/or other materials provided with the distribution.
  36  * 3. All advertising materials mentioning features or use of this software
  37  *    must display the following acknowledgement:
  38  *      This product includes software developed by the University of
  39  *      California, Berkeley and its contributors.
  40  * 4. Neither the name of the University nor the names of its contributors
  41  *    may be used to endorse or promote products derived from this software
  42  *    without specific prior written permission.
  43  *
  44  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  45  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  46  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  47  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  48  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  49  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  50  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  51  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  52  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  53  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  54  * SUCH DAMAGE.
  55  */
  56
  57
  58 #include <sys/types.h>
  59 #include <sys/socket.h>
  60 #include <sys/time.h>
  61 #include <signal.h>
  62 #include <netinet/in.h>
  63 #include <protocols/talkd.h>
  64 #include <errno.h>
  65 #include <setjmp.h>
  66 #include "talk_ctl.h"
  67 #include "talk.h"
  68
  69 /*
  70  * There wasn't an invitation waiting, so send a request containing
  71  * our sockt address to the remote talk daemon so it can invite
  72  * him
  73  */
  74
  75 /*
  76  * The msg.id's for the invitations
  77  * on the local and remote machines.
  78  * These are used to delete the
  79  * invitations.
  80  */
  81 int     local_id, remote_id;
  82 void    re_invite();
  83 jmp_buf invitebuf;
  84
  85 invite_remote()
  86 {
  87         int nfd, read_mask, template, new_sockt;
  88         struct itimerval itimer;
  89         CTL_RESPONSE response;
  90
  91         itimer.it_value.tv_sec = RING_WAIT;
  92         itimer.it_value.tv_usec = 0;
  93         itimer.it_interval = itimer.it_value;
  94         if (listen(sockt, 5) != 0)
  95                 p_error("Error on attempt to listen for caller");
  96 #ifdef MSG_EOR
  97         /* copy new style sockaddr to old, swap family (short in old) */
  98         msg.addr = *(struct osockaddr *)&my_addr;  /* XXX new to old  style*/
  99         msg.addr.sa_family = htons(my_addr.sin_family);
 100 #else
 101         msg.addr = *(struct sockaddr *)&my_addr;
 102 #endif
 103         msg.id_num = htonl(-1);         /* an impossible id_num */
 104         invitation_waiting = 1;
 105         announce_invite();
 106         /*
 107          * Shut off the automatic messages for a while,
 108          * so we can use the interupt timer to resend the invitation
 109          */
 110         end_msgs();
 111         setitimer(ITIMER_REAL, &itimer, (struct itimerval *)0);
 112         message("Waiting for your party to respond");
 113         signal(SIGALRM, re_invite);
 114         (void) setjmp(invitebuf);
 115         while ((new_sockt = accept(sockt, 0, 0)) < 0) {
 116                 if (errno == EINTR)
 117                         continue;
 118                 p_error("Unable to connect with your party");
 119         }
 120         close(sockt);
 121         sockt = new_sockt;
 122
 123         /*
 124          * Have the daemons delete the invitations now that we
 125          * have connected.
 126          */
 127         current_state = "Waiting for your party to respond";
 128         start_msgs();
 129
 130         msg.id_num = htonl(local_id);
 131         ctl_transact(my_machine_addr, msg, DELETE, &response);
 132         msg.id_num = htonl(remote_id);
 133         ctl_transact(his_machine_addr, msg, DELETE, &response);
 134         invitation_waiting = 0;
 135 }
 136
 137 /*
 138  * Routine called on interupt to re-invite the callee
 139  */
 140 void
 141 re_invite()
 142 {
 143
 144         message("Ringing your party again");
 145         current_line++;
 146         /* force a re-announce */
 147         msg.id_num = htonl(remote_id + 1);
 148         announce_invite();
 149         longjmp(invitebuf, 1);
 150 }
 151
 152 static  char *answers[] = {
 153         "answer #0",                                    /* SUCCESS */
 154         "Your party is not logged on",                  /* NOT_HERE */
 155         "Target machine is too confused to talk to us", /* FAILED */
 156         "Target machine does not recognize us",         /* MACHINE_UNKNOWN */
 157         "Your party is refusing messages",              /* PERMISSION_REFUSED */
 158         "Target machine can not handle remote talk",    /* UNKNOWN_REQUEST */
 159         "Target machine indicates protocol mismatch",   /* BADVERSION */
 160         "Target machine indicates protocol botch (addr)",/* BADADDR */
 161         "Target machine indicates protocol botch (ctl_addr)",/* BADCTLADDR */
 162 };
 163 #define NANSWERS        (sizeof (answers) / sizeof (answers[0]))
 164
 165 /*
 166  * Transmit the invitation and process the response
 167  */
 168 announce_invite()
 169 {
 170         CTL_RESPONSE response;
 171
 172         current_state = "Trying to connect to your party's talk daemon";
 173         ctl_transact(his_machine_addr, msg, ANNOUNCE, &response);
 174         remote_id = response.id_num;
 175         if (response.answer != SUCCESS) {
 176                 if (response.answer < NANSWERS)
 177                         message(answers[response.answer]);
 178                 quit();
 179         }
 180         /* leave the actual invitation on my talk daemon */
 181         ctl_transact(my_machine_addr, msg, LEAVE_INVITE, &response);
 182         local_id = response.id_num;
 183 }
 184
 185 /*
 186  * Tell the daemon to remove your invitation
 187  */
 188 send_delete()
 189 {
 190
 191         msg.type = DELETE;
 192         /*
 193          * This is just a extra clean up, so just send it
 194          * and don't wait for an answer
 195          */
 196         msg.id_num = htonl(remote_id);
 197         daemon_addr.sin_addr = his_machine_addr;
 198         if (sendto(ctl_sockt, &msg, sizeof (msg), 0,
 199             (struct sockaddr *)&daemon_addr,
 200             sizeof (daemon_addr)) != sizeof(msg))
 201                 perror("send_delete (remote)");
 202         msg.id_num = htonl(local_id);
 203         daemon_addr.sin_addr = my_machine_addr;
 204         if (sendto(ctl_sockt, &msg, sizeof (msg), 0,
 205             (struct sockaddr *)&daemon_addr,
 206             sizeof (daemon_addr)) != sizeof (msg))
 207                 perror("send_delete (local)");
 208 }