talk.tproj/invite.c

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