1 /* $NetBSD: invite.c,v 1.8 2009/04/13 23:43:36 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. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 #ifndef lint 34 #if 0 35 static char sccsid[] = "@(#)invite.c 8.1 (Berkeley) 6/6/93"; 36 #endif 37 __RCSID("$NetBSD: invite.c,v 1.8 2009/04/13 23:43:36 lukem Exp $"); 38 #endif /* not lint */ 39 40 #include "talk.h" 41 #include <sys/time.h> 42 #include <signal.h> 43 #include <errno.h> 44 #include <setjmp.h> 45 #include <unistd.h> 46 #include "talk_ctl.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() 65 { 66 int 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 talkd_sockaddr *)(void *)&my_addr; 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 interrupt timer to resend the invitation 88 */ 89 end_msgs(); 90 setitimer(ITIMER_REAL, &itimer, (struct itimerval *)0); 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 interrupt to re-invite the callee 118 */ 119 void 120 re_invite(dummy) 121 int dummy; 122 { 123 124 message("Ringing your party again"); 125 current_line++; 126 /* force a re-announce */ 127 msg.id_num = htonl(remote_id + 1); 128 announce_invite(); 129 longjmp(invitebuf, 1); 130 } 131 132 static const char *answers[] = { 133 "answer #0", /* SUCCESS */ 134 "Your party is not logged on", /* NOT_HERE */ 135 "Target machine is too confused to talk to us", /* FAILED */ 136 "Target machine does not recognize us", /* MACHINE_UNKNOWN */ 137 "Your party is refusing messages", /* PERMISSION_REFUSED */ 138 "Target machine can not handle remote talk", /* UNKNOWN_REQUEST */ 139 "Target machine indicates protocol mismatch", /* BADVERSION */ 140 "Target machine indicates protocol botch (addr)",/* BADADDR */ 141 "Target machine indicates protocol botch (ctl_addr)",/* BADCTLADDR */ 142 }; 143 #define NANSWERS (sizeof (answers) / sizeof (answers[0])) 144 145 /* 146 * Transmit the invitation and process the response 147 */ 148 void 149 announce_invite() 150 { 151 CTL_RESPONSE response; 152 153 current_state = "Trying to connect to your party's talk daemon"; 154 ctl_transact(his_machine_addr, msg, ANNOUNCE, &response); 155 remote_id = response.id_num; 156 if (response.answer != SUCCESS) { 157 if (response.answer < NANSWERS) 158 message(answers[response.answer]); 159 quit(); 160 } 161 /* leave the actual invitation on my talk daemon */ 162 ctl_transact(my_machine_addr, msg, LEAVE_INVITE, &response); 163 local_id = response.id_num; 164 } 165 166 /* 167 * Tell the daemon to remove your invitation 168 */ 169 void 170 send_delete() 171 { 172 173 msg.type = DELETE; 174 /* 175 * This is just a extra clean up, so just send it 176 * and don't wait for an answer 177 */ 178 msg.id_num = htonl(remote_id); 179 daemon_addr.sin_addr = his_machine_addr; 180 if (sendto(ctl_sockt, &msg, sizeof (msg), 0, 181 (struct sockaddr *)&daemon_addr, 182 sizeof (daemon_addr)) != sizeof(msg)) 183 perror("send_delete (remote)"); 184 msg.id_num = htonl(local_id); 185 daemon_addr.sin_addr = my_machine_addr; 186 if (sendto(ctl_sockt, &msg, sizeof (msg), 0, 187 (struct sockaddr *)&daemon_addr, 188 sizeof (daemon_addr)) != sizeof (msg)) 189 perror("send_delete (local)"); 190 } 191