talk.tproj/invite.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25 /*
  26  * Copyright (c) 1983, 1993
  27  *      The Regents of the University of California.  All rights reserved.
  28  *
  29  * Redistribution and use in source and binary forms, with or without
  30  * modification, are permitted provided that the following conditions
  31  * are met:
  32  * 1. Redistributions of source code must retain the above copyright
  33  *    notice, this list of conditions and the following disclaimer.
  34  * 2. Redistributions in binary form must reproduce the above copyright
  35  *    notice, this list of conditions and the following disclaimer in the
  36  *    documentation and/or other materials provided with the distribution.
  37  * 3. All advertising materials mentioning features or use of this software
  38  *    must display the following acknowledgement:
  39  *      This product includes software developed by the University of
  40  *      California, Berkeley and its contributors.
  41  * 4. Neither the name of the University nor the names of its contributors
  42  *    may be used to endorse or promote products derived from this software
  43  *    without specific prior written permission.
  44  *
  45  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  46  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  47  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  48  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  49  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  50  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  51  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  52  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  53  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  54  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  55  * SUCH DAMAGE.
  56  */
  57
  58
  59 #include <sys/types.h>
  60 #include <sys/socket.h>
  61 #include <sys/time.h>
  62 #include <signal.h>
  63 #include <netinet/in.h>
  64 #include <protocols/talkd.h>
  65 #include <errno.h>
  66 #include <setjmp.h>
  67 #include "talk_ctl.h"
  68 #include "talk.h"
  69
  70 /*
  71  * There wasn't an invitation waiting, so send a request containing
  72  * our sockt address to the remote talk daemon so it can invite
  73  * him
  74  */
  75
  76 /*
  77  * The msg.id's for the invitations
  78  * on the local and remote machines.
  79  * These are used to delete the
  80  * invitations.
  81  */
  82 int     local_id, remote_id;
  83 void    re_invite();
  84 jmp_buf invitebuf;
  85
  86 invite_remote()
  87 {
  88         int nfd, read_mask, template, new_sockt;
  89         struct itimerval itimer;
  90         CTL_RESPONSE response;
  91
  92         itimer.it_value.tv_sec = RING_WAIT;
  93         itimer.it_value.tv_usec = 0;
  94         itimer.it_interval = itimer.it_value;
  95         if (listen(sockt, 5) != 0)
  96                 p_error("Error on attempt to listen for caller");
  97 #ifdef MSG_EOR
  98         /* copy new style sockaddr to old, swap family (short in old) */
  99         msg.addr = *(struct osockaddr *)&my_addr;  /* XXX new to old  style*/
 100         msg.addr.sa_family = htons(my_addr.sin_family);
 101 #else
 102         msg.addr = *(struct sockaddr *)&my_addr;
 103 #endif
 104         msg.id_num = htonl(-1);         /* an impossible id_num */
 105         invitation_waiting = 1;
 106         announce_invite();
 107         /*
 108          * Shut off the automatic messages for a while,
 109          * so we can use the interupt timer to resend the invitation
 110          */
 111         end_msgs();
 112         setitimer(ITIMER_REAL, &itimer, (struct itimerval *)0);
 113         message("Waiting for your party to respond");
 114         signal(SIGALRM, re_invite);
 115         (void) setjmp(invitebuf);
 116         while ((new_sockt = accept(sockt, 0, 0)) < 0) {
 117                 if (errno == EINTR)
 118                         continue;
 119                 p_error("Unable to connect with your party");
 120         }
 121         close(sockt);
 122         sockt = new_sockt;
 123
 124         /*
 125          * Have the daemons delete the invitations now that we
 126          * have connected.
 127          */
 128         current_state = "Waiting for your party to respond";
 129         start_msgs();
 130
 131         msg.id_num = htonl(local_id);
 132         ctl_transact(my_machine_addr, msg, DELETE, &response);
 133         msg.id_num = htonl(remote_id);
 134         ctl_transact(his_machine_addr, msg, DELETE, &response);
 135         invitation_waiting = 0;
 136 }
 137
 138 /*
 139  * Routine called on interupt to re-invite the callee
 140  */
 141 void
 142 re_invite()
 143 {
 144
 145         message("Ringing your party again");
 146         current_line++;
 147         /* force a re-announce */
 148         msg.id_num = htonl(remote_id + 1);
 149         announce_invite();
 150         longjmp(invitebuf, 1);
 151 }
 152
 153 static  char *answers[] = {
 154         "answer #0",                                    /* SUCCESS */
 155         "Your party is not logged on",                  /* NOT_HERE */
 156         "Target machine is too confused to talk to us", /* FAILED */
 157         "Target machine does not recognize us",         /* MACHINE_UNKNOWN */
 158         "Your party is refusing messages",              /* PERMISSION_REFUSED */
 159         "Target machine can not handle remote talk",    /* UNKNOWN_REQUEST */
 160         "Target machine indicates protocol mismatch",   /* BADVERSION */
 161         "Target machine indicates protocol botch (addr)",/* BADADDR */
 162         "Target machine indicates protocol botch (ctl_addr)",/* BADCTLADDR */
 163 };
 164 #define NANSWERS        (sizeof (answers) / sizeof (answers[0]))
 165
 166 /*
 167  * Transmit the invitation and process the response
 168  */
 169 announce_invite()
 170 {
 171         CTL_RESPONSE response;
 172
 173         current_state = "Trying to connect to your party's talk daemon";
 174         ctl_transact(his_machine_addr, msg, ANNOUNCE, &response);
 175         remote_id = response.id_num;
 176         if (response.answer != SUCCESS) {
 177                 if (response.answer < NANSWERS)
 178                         message(answers[response.answer]);
 179                 quit();
 180         }
 181         /* leave the actual invitation on my talk daemon */
 182         ctl_transact(my_machine_addr, msg, LEAVE_INVITE, &response);
 183         local_id = response.id_num;
 184 }
 185
 186 /*
 187  * Tell the daemon to remove your invitation
 188  */
 189 send_delete()
 190 {
 191
 192         msg.type = DELETE;
 193         /*
 194          * This is just a extra clean up, so just send it
 195          * and don't wait for an answer
 196          */
 197         msg.id_num = htonl(remote_id);
 198         daemon_addr.sin_addr = his_machine_addr;
 199         if (sendto(ctl_sockt, &msg, sizeof (msg), 0,
 200             (struct sockaddr *)&daemon_addr,
 201             sizeof (daemon_addr)) != sizeof(msg))
 202                 perror("send_delete (remote)");
 203         msg.id_num = htonl(local_id);
 204         daemon_addr.sin_addr = my_machine_addr;
 205         if (sendto(ctl_sockt, &msg, sizeof (msg), 0,
 206             (struct sockaddr *)&daemon_addr,
 207             sizeof (daemon_addr)) != sizeof (msg))
 208                 perror("send_delete (local)");
 209 }