1 /* $OpenBSD: invite.c,v 1.3 1996/06/26 05:40:23 deraadt Exp $ */ 2 /* $NetBSD: invite.c,v 1.3 1994/12/09 02:14:18 jtc Exp $ */ 3 4 /* 5 * Copyright (c) 1983, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 37 #ifndef lint 38 #if 0 39 static char sccsid[] = "@(#)invite.c 8.1 (Berkeley) 6/6/93"; 40 #endif 41 static char rcsid[] = "$OpenBSD: invite.c,v 1.3 1996/06/26 05:40:23 deraadt Exp $"; 42 #endif /* not lint */ 43 44 #include <sys/types.h> 45 #include <sys/socket.h> 46 #include <sys/time.h> 47 #include <signal.h> 48 #include <netinet/in.h> 49 #include <protocols/talkd.h> 50 #include <errno.h> 51 #include <setjmp.h> 52 #include "talk_ctl.h" 53 #include "talk.h" 54 55 /* 56 * There wasn't an invitation waiting, so send a request containing 57 * our sockt address to the remote talk daemon so it can invite 58 * him 59 */ 60 61 /* 62 * The msg.id's for the invitations 63 * on the local and remote machines. 64 * These are used to delete the 65 * invitations. 66 */ 67 int local_id, remote_id; 68 void re_invite(); 69 jmp_buf invitebuf; 70 71 invite_remote() 72 { 73 int nfd, read_mask, template, new_sockt; 74 struct itimerval itimer; 75 CTL_RESPONSE response; 76 77 itimer.it_value.tv_sec = RING_WAIT; 78 itimer.it_value.tv_usec = 0; 79 itimer.it_interval = itimer.it_value; 80 if (listen(sockt, 5) != 0) 81 p_error("Error on attempt to listen for caller"); 82 #ifdef MSG_EOR 83 /* copy new style sockaddr to old, swap family (short in old) */ 84 msg.addr = *(struct osockaddr *)&my_addr; /* XXX new to old style*/ 85 msg.addr.sa_family = htons(my_addr.sin_family); 86 #else 87 msg.addr = *(struct sockaddr *)&my_addr; 88 #endif 89 msg.id_num = htonl(-1); /* an impossible id_num */ 90 invitation_waiting = 1; 91 announce_invite(); 92 /* 93 * Shut off the automatic messages for a while, 94 * so we can use the interupt timer to resend the invitation 95 */ 96 end_msgs(); 97 setitimer(ITIMER_REAL, &itimer, (struct itimerval *)0); 98 message("Waiting for your party to respond"); 99 signal(SIGALRM, re_invite); 100 (void) setjmp(invitebuf); 101 while ((new_sockt = accept(sockt, 0, 0)) < 0) { 102 if (errno == EINTR) 103 continue; 104 p_error("Unable to connect with your party"); 105 } 106 close(sockt); 107 sockt = new_sockt; 108 109 /* 110 * Have the daemons delete the invitations now that we 111 * have connected. 112 */ 113 current_state = "Waiting for your party to respond"; 114 start_msgs(); 115 116 msg.id_num = htonl(local_id); 117 ctl_transact(my_machine_addr, msg, DELETE, &response); 118 msg.id_num = htonl(remote_id); 119 ctl_transact(his_machine_addr, msg, DELETE, &response); 120 invitation_waiting = 0; 121 } 122 123 /* 124 * Routine called on interupt to re-invite the callee 125 */ 126 void 127 re_invite() 128 { 129 130 message("Ringing your party again"); 131 /* force a re-announce */ 132 msg.id_num = htonl(remote_id + 1); 133 announce_invite(); 134 longjmp(invitebuf, 1); 135 } 136 137 static char *answers[] = { 138 "answer #0", /* SUCCESS */ 139 "Your party is not logged on", /* NOT_HERE */ 140 "Target machine is too confused to talk to us", /* FAILED */ 141 "Target machine does not recognize us", /* MACHINE_UNKNOWN */ 142 "Your party is refusing messages", /* PERMISSION_REFUSED */ 143 "Target machine can not handle remote talk", /* UNKNOWN_REQUEST */ 144 "Target machine indicates protocol mismatch", /* BADVERSION */ 145 "Target machine indicates protocol botch (addr)",/* BADADDR */ 146 "Target machine indicates protocol botch (ctl_addr)",/* BADCTLADDR */ 147 }; 148 #define NANSWERS (sizeof (answers) / sizeof (answers[0])) 149 150 /* 151 * Transmit the invitation and process the response 152 */ 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 send_delete() 174 { 175 176 msg.type = DELETE; 177 /* 178 * This is just a extra clean up, so just send it 179 * and don't wait for an answer 180 */ 181 msg.id_num = htonl(remote_id); 182 daemon_addr.sin_addr = his_machine_addr; 183 if (sendto(ctl_sockt, &msg, sizeof (msg), 0, 184 (struct sockaddr *)&daemon_addr, 185 sizeof (daemon_addr)) != sizeof(msg)) 186 perror("send_delete (remote)"); 187 msg.id_num = htonl(local_id); 188 daemon_addr.sin_addr = my_machine_addr; 189 if (sendto(ctl_sockt, &msg, sizeof (msg), 0, 190 (struct sockaddr *)&daemon_addr, 191 sizeof (daemon_addr)) != sizeof (msg)) 192 perror("send_delete (local)"); 193 } 194