1 /* 2 * Copyright (c) 1983, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #include <sys/cdefs.h> 35 36 __FBSDID("$FreeBSD$"); 37 38 #ifndef lint 39 static const char sccsid[] = "@(#)invite.c 8.1 (Berkeley) 6/6/93"; 40 #endif 41 42 #include <sys/types.h> 43 #include <sys/socket.h> 44 #include <protocols/talkd.h> 45 46 #include <err.h> 47 #include <errno.h> 48 #include <setjmp.h> 49 #include <signal.h> 50 51 #include "talk_ctl.h" 52 #include "talk.h" 53 54 /* 55 * There wasn't an invitation waiting, so send a request containing 56 * our sockt address to the remote talk daemon so it can invite 57 * him 58 */ 59 60 /* 61 * The msg.id's for the invitations 62 * on the local and remote machines. 63 * These are used to delete the 64 * invitations. 65 */ 66 int local_id, remote_id; 67 jmp_buf invitebuf; 68 69 void 70 invite_remote(void) 71 { 72 int new_sockt; 73 struct itimerval itimer; 74 CTL_RESPONSE response; 75 76 itimer.it_value.tv_sec = RING_WAIT; 77 itimer.it_value.tv_usec = 0; 78 itimer.it_interval = itimer.it_value; 79 if (listen(sockt, 5) != 0) 80 p_error("Error on attempt to listen for caller"); 81 #ifdef MSG_EOR 82 /* copy new style sockaddr to old, swap family (short in old) */ 83 msg.addr = *(struct osockaddr *)&my_addr; /* XXX new to old style*/ 84 msg.addr.sa_family = htons(my_addr.sin_family); 85 #else 86 msg.addr = *(struct sockaddr *)&my_addr; 87 #endif 88 msg.id_num = htonl(-1); /* an impossible id_num */ 89 invitation_waiting = 1; 90 announce_invite(); 91 /* 92 * Shut off the automatic messages for a while, 93 * so we can use the interupt timer to resend the invitation 94 */ 95 end_msgs(); 96 setitimer(ITIMER_REAL, &itimer, (struct itimerval *)0); 97 message("Waiting for your party to respond"); 98 signal(SIGALRM, re_invite); 99 (void) setjmp(invitebuf); 100 while ((new_sockt = accept(sockt, 0, 0)) < 0) { 101 if (errno == EINTR) 102 continue; 103 p_error("Unable to connect with your party"); 104 } 105 close(sockt); 106 sockt = new_sockt; 107 108 /* 109 * Have the daemons delete the invitations now that we 110 * have connected. 111 */ 112 current_state = "Waiting for your party to respond"; 113 start_msgs(); 114 115 msg.id_num = htonl(local_id); 116 ctl_transact(my_machine_addr, msg, DELETE, &response); 117 msg.id_num = htonl(remote_id); 118 ctl_transact(his_machine_addr, msg, DELETE, &response); 119 invitation_waiting = 0; 120 } 121 122 /* 123 * Routine called on interupt to re-invite the callee 124 */ 125 /* ARGSUSED */ 126 void 127 re_invite(int signo __unused) 128 { 129 130 message("Ringing your party again"); 131 waddch(my_win.x_win, '\n'); 132 if (current_line < my_win.x_nlines - 1) 133 current_line++; 134 /* force a re-announce */ 135 msg.id_num = htonl(remote_id + 1); 136 announce_invite(); 137 longjmp(invitebuf, 1); 138 } 139 140 static const char *answers[] = { 141 "answer #0", /* SUCCESS */ 142 "Your party is not logged on", /* NOT_HERE */ 143 "Target machine is too confused to talk to us", /* FAILED */ 144 "Target machine does not recognize us", /* MACHINE_UNKNOWN */ 145 "Your party is refusing messages", /* PERMISSION_REFUSED */ 146 "Target machine can not handle remote talk", /* UNKNOWN_REQUEST */ 147 "Target machine indicates protocol mismatch", /* BADVERSION */ 148 "Target machine indicates protocol botch (addr)",/* BADADDR */ 149 "Target machine indicates protocol botch (ctl_addr)",/* BADCTLADDR */ 150 }; 151 #define NANSWERS (sizeof (answers) / sizeof (answers[0])) 152 153 /* 154 * Transmit the invitation and process the response 155 */ 156 void 157 announce_invite(void) 158 { 159 CTL_RESPONSE response; 160 161 current_state = "Trying to connect to your party's talk daemon"; 162 ctl_transact(his_machine_addr, msg, ANNOUNCE, &response); 163 remote_id = response.id_num; 164 if (response.answer != SUCCESS) { 165 if (response.answer < NANSWERS) 166 message(answers[response.answer]); 167 quit(); 168 } 169 /* leave the actual invitation on my talk daemon */ 170 current_state = "Trying to connect to local talk daemon"; 171 ctl_transact(my_machine_addr, msg, LEAVE_INVITE, &response); 172 local_id = response.id_num; 173 } 174 175 /* 176 * Tell the daemon to remove your invitation 177 */ 178 void 179 send_delete(void) 180 { 181 182 msg.type = DELETE; 183 /* 184 * This is just an extra clean up, so just send it 185 * and don't wait for an answer 186 */ 187 msg.id_num = htonl(remote_id); 188 daemon_addr.sin_addr = his_machine_addr; 189 if (sendto(ctl_sockt, &msg, sizeof (msg), 0, 190 (struct sockaddr *)&daemon_addr, 191 sizeof (daemon_addr)) != sizeof(msg)) 192 warn("send_delete (remote)"); 193 msg.id_num = htonl(local_id); 194 daemon_addr.sin_addr = my_machine_addr; 195 if (sendto(ctl_sockt, &msg, sizeof (msg), 0, 196 (struct sockaddr *)&daemon_addr, 197 sizeof (daemon_addr)) != sizeof (msg)) 198 warn("send_delete (local)"); 199 } 200