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 #include <sys/cdefs.h> 33 34 __FBSDID("$FreeBSD$"); 35 36 #ifndef lint 37 static const char sccsid[] = "@(#)invite.c 8.1 (Berkeley) 6/6/93"; 38 #endif 39 40 #include <sys/types.h> 41 #include <sys/socket.h> 42 #include <protocols/talkd.h> 43 44 #include <err.h> 45 #include <errno.h> 46 #include <setjmp.h> 47 #include <signal.h> 48 #include <unistd.h> 49 50 #include "talk_ctl.h" 51 #include "talk.h" 52 53 /* 54 * There wasn't an invitation waiting, so send a request containing 55 * our sockt address to the remote talk daemon so it can invite 56 * him 57 */ 58 59 /* 60 * The msg.id's for the invitations 61 * on the local and remote machines. 62 * These are used to delete the 63 * invitations. 64 */ 65 static int local_id, remote_id; 66 static jmp_buf invitebuf; 67 68 void 69 invite_remote(void) 70 { 71 int new_sockt; 72 struct itimerval itimer; 73 CTL_RESPONSE response; 74 75 itimer.it_value.tv_sec = RING_WAIT; 76 itimer.it_value.tv_usec = 0; 77 itimer.it_interval = itimer.it_value; 78 if (listen(sockt, 5) != 0) 79 p_error("Error on attempt to listen for caller"); 80 /* copy new style sockaddr to old, swap family (short in old) */ 81 msg.addr = *(struct tsockaddr *)&my_addr; 82 msg.addr.sa_family = htons(my_addr.sin_family); 83 msg.id_num = htonl(-1); /* an impossible id_num */ 84 invitation_waiting = 1; 85 announce_invite(); 86 /* 87 * Shut off the automatic messages for a while, 88 * so we can use the interrupt timer to resend the invitation 89 */ 90 end_msgs(); 91 setitimer(ITIMER_REAL, &itimer, (struct itimerval *)0); 92 message("Waiting for your party to respond"); 93 signal(SIGALRM, re_invite); 94 (void) setjmp(invitebuf); 95 while ((new_sockt = accept(sockt, 0, 0)) < 0) { 96 if (errno == EINTR) 97 continue; 98 p_error("Unable to connect with your party"); 99 } 100 close(sockt); 101 sockt = new_sockt; 102 103 /* 104 * Have the daemons delete the invitations now that we 105 * have connected. 106 */ 107 current_state = "Waiting for your party to respond"; 108 start_msgs(); 109 110 msg.id_num = htonl(local_id); 111 ctl_transact(my_machine_addr, msg, DELETE, &response); 112 msg.id_num = htonl(remote_id); 113 ctl_transact(his_machine_addr, msg, DELETE, &response); 114 invitation_waiting = 0; 115 } 116 117 /* 118 * Routine called on interrupt to re-invite the callee 119 */ 120 /* ARGSUSED */ 121 void 122 re_invite(int signo __unused) 123 { 124 125 message("Ringing your party again"); 126 waddch(my_win.x_win, '\n'); 127 if (current_line < my_win.x_nlines - 1) 128 current_line++; 129 /* force a re-announce */ 130 msg.id_num = htonl(remote_id + 1); 131 announce_invite(); 132 longjmp(invitebuf, 1); 133 } 134 135 static const char *answers[] = { 136 "answer #0", /* SUCCESS */ 137 "Your party is not logged on", /* NOT_HERE */ 138 "Target machine is too confused to talk to us", /* FAILED */ 139 "Target machine does not recognize us", /* MACHINE_UNKNOWN */ 140 "Your party is refusing messages", /* PERMISSION_REFUSED */ 141 "Target machine can not handle remote talk", /* UNKNOWN_REQUEST */ 142 "Target machine indicates protocol mismatch", /* BADVERSION */ 143 "Target machine indicates protocol botch (addr)",/* BADADDR */ 144 "Target machine indicates protocol botch (ctl_addr)",/* BADCTLADDR */ 145 }; 146 #define NANSWERS (sizeof (answers) / sizeof (answers[0])) 147 148 /* 149 * Transmit the invitation and process the response 150 */ 151 void 152 announce_invite(void) 153 { 154 CTL_RESPONSE response; 155 156 current_state = "Trying to connect to your party's talk daemon"; 157 ctl_transact(his_machine_addr, msg, ANNOUNCE, &response); 158 remote_id = response.id_num; 159 if (response.answer != SUCCESS) { 160 if (response.answer < NANSWERS) 161 message(answers[response.answer]); 162 quit(); 163 } 164 /* leave the actual invitation on my talk daemon */ 165 current_state = "Trying to connect to local 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(void) 175 { 176 177 msg.type = DELETE; 178 /* 179 * This is just an 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 warn("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 warn("send_delete (local)"); 194 } 195