1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 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 33 #ifndef lint 34 static const char sccsid[] = "@(#)invite.c 8.1 (Berkeley) 6/6/93"; 35 #endif 36 37 #include <sys/types.h> 38 #include <sys/socket.h> 39 #include <protocols/talkd.h> 40 41 #include <err.h> 42 #include <errno.h> 43 #include <setjmp.h> 44 #include <signal.h> 45 #include <unistd.h> 46 47 #include "talk_ctl.h" 48 #include "talk.h" 49 50 /* 51 * There wasn't an invitation waiting, so send a request containing 52 * our sockt address to the remote talk daemon so it can invite 53 * him 54 */ 55 56 /* 57 * The msg.id's for the invitations 58 * on the local and remote machines. 59 * These are used to delete the 60 * invitations. 61 */ 62 static int local_id, remote_id; 63 static jmp_buf invitebuf; 64 65 void 66 invite_remote(void) 67 { 68 int new_sockt; 69 struct itimerval itimer; 70 CTL_RESPONSE response; 71 72 itimer.it_value.tv_sec = RING_WAIT; 73 itimer.it_value.tv_usec = 0; 74 itimer.it_interval = itimer.it_value; 75 if (listen(sockt, 5) != 0) 76 p_error("Error on attempt to listen for caller"); 77 /* copy new style sockaddr to old, swap family (short in old) */ 78 msg.addr = *(struct tsockaddr *)&my_addr; 79 msg.addr.sa_family = htons(my_addr.sin_family); 80 msg.id_num = htonl(-1); /* an impossible id_num */ 81 invitation_waiting = 1; 82 announce_invite(); 83 /* 84 * Shut off the automatic messages for a while, 85 * so we can use the interrupt timer to resend the invitation 86 */ 87 end_msgs(); 88 setitimer(ITIMER_REAL, &itimer, (struct itimerval *)0); 89 message("Waiting for your party to respond"); 90 signal(SIGALRM, re_invite); 91 (void) setjmp(invitebuf); 92 while ((new_sockt = accept(sockt, 0, 0)) < 0) { 93 if (errno == EINTR) 94 continue; 95 p_error("Unable to connect with your party"); 96 } 97 close(sockt); 98 sockt = new_sockt; 99 100 /* 101 * Have the daemons delete the invitations now that we 102 * have connected. 103 */ 104 current_state = "Waiting for your party to respond"; 105 start_msgs(); 106 107 msg.id_num = htonl(local_id); 108 ctl_transact(my_machine_addr, msg, DELETE, &response); 109 msg.id_num = htonl(remote_id); 110 ctl_transact(his_machine_addr, msg, DELETE, &response); 111 invitation_waiting = 0; 112 } 113 114 /* 115 * Routine called on interrupt to re-invite the callee 116 */ 117 /* ARGSUSED */ 118 void 119 re_invite(int signo __unused) 120 { 121 122 message("Ringing your party again"); 123 waddch(my_win.x_win, '\n'); 124 if (current_line < my_win.x_nlines - 1) 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(void) 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 current_state = "Trying to connect to local talk daemon"; 163 ctl_transact(my_machine_addr, msg, LEAVE_INVITE, &response); 164 local_id = response.id_num; 165 } 166 167 /* 168 * Tell the daemon to remove your invitation 169 */ 170 void 171 send_delete(void) 172 { 173 174 msg.type = DELETE; 175 /* 176 * This is just an extra clean up, so just send it 177 * and don't wait for an answer 178 */ 179 msg.id_num = htonl(remote_id); 180 daemon_addr.sin_addr = his_machine_addr; 181 if (sendto(ctl_sockt, &msg, sizeof (msg), 0, 182 (struct sockaddr *)&daemon_addr, 183 sizeof (daemon_addr)) != sizeof(msg)) 184 warn("send_delete (remote)"); 185 msg.id_num = htonl(local_id); 186 daemon_addr.sin_addr = my_machine_addr; 187 if (sendto(ctl_sockt, &msg, sizeof (msg), 0, 188 (struct sockaddr *)&daemon_addr, 189 sizeof (daemon_addr)) != sizeof (msg)) 190 warn("send_delete (local)"); 191 } 192