1 /* $NetBSD: invite.c,v 1.4 1997/10/20 00:23:23 lukem Exp $ */ 2 3 /* 4 * Copyright (c) 1983, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 #ifndef lint 38 #if 0 39 static char sccsid[] = "@(#)invite.c 8.1 (Berkeley) 6/6/93"; 40 #endif 41 __RCSID("$NetBSD: invite.c,v 1.4 1997/10/20 00:23:23 lukem Exp $"); 42 #endif /* not lint */ 43 44 #include "talk.h" 45 #include <sys/time.h> 46 #include <signal.h> 47 #include <errno.h> 48 #include <setjmp.h> 49 #include <unistd.h> 50 #include "talk_ctl.h" 51 52 /* 53 * There wasn't an invitation waiting, so send a request containing 54 * our sockt address to the remote talk daemon so it can invite 55 * him 56 */ 57 58 /* 59 * The msg.id's for the invitations 60 * on the local and remote machines. 61 * These are used to delete the 62 * invitations. 63 */ 64 int local_id, remote_id; 65 jmp_buf invitebuf; 66 67 void 68 invite_remote() 69 { 70 int new_sockt; 71 struct itimerval itimer; 72 CTL_RESPONSE response; 73 74 itimer.it_value.tv_sec = RING_WAIT; 75 itimer.it_value.tv_usec = 0; 76 itimer.it_interval = itimer.it_value; 77 if (listen(sockt, 5) != 0) 78 p_error("Error on attempt to listen for caller"); 79 #ifdef MSG_EOR 80 /* copy new style sockaddr to old, swap family (short in old) */ 81 msg.addr = *(struct osockaddr *)&my_addr; /* XXX new to old style*/ 82 msg.addr.sa_family = htons(my_addr.sin_family); 83 #else 84 msg.addr = *(struct sockaddr *)&my_addr; 85 #endif 86 msg.id_num = htonl(-1); /* an impossible id_num */ 87 invitation_waiting = 1; 88 announce_invite(); 89 /* 90 * Shut off the automatic messages for a while, 91 * so we can use the interupt timer to resend the invitation 92 */ 93 end_msgs(); 94 setitimer(ITIMER_REAL, &itimer, (struct itimerval *)0); 95 message("Waiting for your party to respond"); 96 signal(SIGALRM, re_invite); 97 (void) setjmp(invitebuf); 98 while ((new_sockt = accept(sockt, 0, 0)) < 0) { 99 if (errno == EINTR) 100 continue; 101 p_error("Unable to connect with your party"); 102 } 103 close(sockt); 104 sockt = new_sockt; 105 106 /* 107 * Have the daemons delete the invitations now that we 108 * have connected. 109 */ 110 current_state = "Waiting for your party to respond"; 111 start_msgs(); 112 113 msg.id_num = htonl(local_id); 114 ctl_transact(my_machine_addr, msg, DELETE, &response); 115 msg.id_num = htonl(remote_id); 116 ctl_transact(his_machine_addr, msg, DELETE, &response); 117 invitation_waiting = 0; 118 } 119 120 /* 121 * Routine called on interupt to re-invite the callee 122 */ 123 void 124 re_invite(dummy) 125 int dummy; 126 { 127 128 message("Ringing your party again"); 129 current_line++; 130 /* force a re-announce */ 131 msg.id_num = htonl(remote_id + 1); 132 announce_invite(); 133 longjmp(invitebuf, 1); 134 } 135 136 static char *answers[] = { 137 "answer #0", /* SUCCESS */ 138 "Your party is not logged on", /* NOT_HERE */ 139 "Target machine is too confused to talk to us", /* FAILED */ 140 "Target machine does not recognize us", /* MACHINE_UNKNOWN */ 141 "Your party is refusing messages", /* PERMISSION_REFUSED */ 142 "Target machine can not handle remote talk", /* UNKNOWN_REQUEST */ 143 "Target machine indicates protocol mismatch", /* BADVERSION */ 144 "Target machine indicates protocol botch (addr)",/* BADADDR */ 145 "Target machine indicates protocol botch (ctl_addr)",/* BADCTLADDR */ 146 }; 147 #define NANSWERS (sizeof (answers) / sizeof (answers[0])) 148 149 /* 150 * Transmit the invitation and process the response 151 */ 152 void 153 announce_invite() 154 { 155 CTL_RESPONSE response; 156 157 current_state = "Trying to connect to your party's talk daemon"; 158 ctl_transact(his_machine_addr, msg, ANNOUNCE, &response); 159 remote_id = response.id_num; 160 if (response.answer != SUCCESS) { 161 if (response.answer < NANSWERS) 162 message(answers[response.answer]); 163 quit(); 164 } 165 /* leave the actual invitation on my talk daemon */ 166 ctl_transact(my_machine_addr, msg, LEAVE_INVITE, &response); 167 local_id = response.id_num; 168 } 169 170 /* 171 * Tell the daemon to remove your invitation 172 */ 173 void 174 send_delete() 175 { 176 177 msg.type = DELETE; 178 /* 179 * This is just a extra clean up, so just send it 180 * and don't wait for an answer 181 */ 182 msg.id_num = htonl(remote_id); 183 daemon_addr.sin_addr = his_machine_addr; 184 if (sendto(ctl_sockt, &msg, sizeof (msg), 0, 185 (struct sockaddr *)&daemon_addr, 186 sizeof (daemon_addr)) != sizeof(msg)) 187 perror("send_delete (remote)"); 188 msg.id_num = htonl(local_id); 189 daemon_addr.sin_addr = my_machine_addr; 190 if (sendto(ctl_sockt, &msg, sizeof (msg), 0, 191 (struct sockaddr *)&daemon_addr, 192 sizeof (daemon_addr)) != sizeof (msg)) 193 perror("send_delete (local)"); 194 } 195