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 34 #include <sys/types.h> 35 #include <sys/socket.h> 36 #include <protocols/talkd.h> 37 38 #include <err.h> 39 #include <errno.h> 40 #include <setjmp.h> 41 #include <signal.h> 42 #include <unistd.h> 43 44 #include "talk_ctl.h" 45 #include "talk.h" 46 47 /* 48 * There wasn't an invitation waiting, so send a request containing 49 * our sockt address to the remote talk daemon so it can invite 50 * him 51 */ 52 53 /* 54 * The msg.id's for the invitations 55 * on the local and remote machines. 56 * These are used to delete the 57 * invitations. 58 */ 59 static int local_id, remote_id; 60 static jmp_buf invitebuf; 61 62 void 63 invite_remote(void) 64 { 65 int new_sockt; 66 struct itimerval itimer; 67 CTL_RESPONSE response; 68 69 itimer.it_value.tv_sec = RING_WAIT; 70 itimer.it_value.tv_usec = 0; 71 itimer.it_interval = itimer.it_value; 72 if (listen(sockt, 5) != 0) 73 p_error("Error on attempt to listen for caller"); 74 /* copy new style sockaddr to old, swap family (short in old) */ 75 msg.addr = *(struct tsockaddr *)&my_addr; 76 msg.addr.sa_family = htons(my_addr.sin_family); 77 msg.id_num = htonl(-1); /* an impossible id_num */ 78 invitation_waiting = 1; 79 announce_invite(); 80 /* 81 * Shut off the automatic messages for a while, 82 * so we can use the interrupt timer to resend the invitation 83 */ 84 end_msgs(); 85 setitimer(ITIMER_REAL, &itimer, (struct itimerval *)0); 86 message("Waiting for your party to respond"); 87 signal(SIGALRM, re_invite); 88 (void) setjmp(invitebuf); 89 while ((new_sockt = accept(sockt, 0, 0)) < 0) { 90 if (errno == EINTR) 91 continue; 92 p_error("Unable to connect with your party"); 93 } 94 close(sockt); 95 sockt = new_sockt; 96 97 /* 98 * Have the daemons delete the invitations now that we 99 * have connected. 100 */ 101 current_state = "Waiting for your party to respond"; 102 start_msgs(); 103 104 msg.id_num = htonl(local_id); 105 ctl_transact(my_machine_addr, msg, DELETE, &response); 106 msg.id_num = htonl(remote_id); 107 ctl_transact(his_machine_addr, msg, DELETE, &response); 108 invitation_waiting = 0; 109 } 110 111 /* 112 * Routine called on interrupt to re-invite the callee 113 */ 114 /* ARGSUSED */ 115 void 116 re_invite(int signo __unused) 117 { 118 119 message("Ringing your party again"); 120 waddch(my_win.x_win, '\n'); 121 if (current_line < my_win.x_nlines - 1) 122 current_line++; 123 /* force a re-announce */ 124 msg.id_num = htonl(remote_id + 1); 125 announce_invite(); 126 longjmp(invitebuf, 1); 127 } 128 129 static const char *answers[] = { 130 "answer #0", /* SUCCESS */ 131 "Your party is not logged on", /* NOT_HERE */ 132 "Target machine is too confused to talk to us", /* FAILED */ 133 "Target machine does not recognize us", /* MACHINE_UNKNOWN */ 134 "Your party is refusing messages", /* PERMISSION_REFUSED */ 135 "Target machine can not handle remote talk", /* UNKNOWN_REQUEST */ 136 "Target machine indicates protocol mismatch", /* BADVERSION */ 137 "Target machine indicates protocol botch (addr)",/* BADADDR */ 138 "Target machine indicates protocol botch (ctl_addr)",/* BADCTLADDR */ 139 }; 140 #define NANSWERS (sizeof (answers) / sizeof (answers[0])) 141 142 /* 143 * Transmit the invitation and process the response 144 */ 145 void 146 announce_invite(void) 147 { 148 CTL_RESPONSE response; 149 150 current_state = "Trying to connect to your party's talk daemon"; 151 ctl_transact(his_machine_addr, msg, ANNOUNCE, &response); 152 remote_id = response.id_num; 153 if (response.answer != SUCCESS) { 154 if (response.answer < NANSWERS) 155 message(answers[response.answer]); 156 quit(); 157 } 158 /* leave the actual invitation on my talk daemon */ 159 current_state = "Trying to connect to local talk daemon"; 160 ctl_transact(my_machine_addr, msg, LEAVE_INVITE, &response); 161 local_id = response.id_num; 162 } 163 164 /* 165 * Tell the daemon to remove your invitation 166 */ 167 void 168 send_delete(void) 169 { 170 171 msg.type = DELETE; 172 /* 173 * This is just an extra clean up, so just send it 174 * and don't wait for an answer 175 */ 176 msg.id_num = htonl(remote_id); 177 daemon_addr.sin_addr = his_machine_addr; 178 if (sendto(ctl_sockt, &msg, sizeof (msg), 0, 179 (struct sockaddr *)&daemon_addr, 180 sizeof (daemon_addr)) != sizeof(msg)) 181 warn("send_delete (remote)"); 182 msg.id_num = htonl(local_id); 183 daemon_addr.sin_addr = my_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 (local)"); 188 } 189