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 * @(#)invite.c 8.1 (Berkeley) 6/6/93 34 * $FreeBSD: src/usr.bin/talk/invite.c,v 1.6.2.1 2000/10/05 17:40:38 ru Exp $ 35 */ 36 37 #include <sys/param.h> 38 #include <sys/socket.h> 39 #include <err.h> 40 #include <errno.h> 41 #include <setjmp.h> 42 #include <signal.h> 43 #include <protocols/talkd.h> 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 int local_id, remote_id; 60 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 #ifdef MSG_EOR 75 /* copy new style sockaddr to old, swap family (short in old) */ 76 msg.addr = *(struct osockaddr *)&my_addr; /* XXX new to old style*/ 77 msg.addr.sa_family = htons(my_addr.sin_family); 78 #else 79 msg.addr = *(struct sockaddr *)&my_addr; 80 #endif 81 msg.id_num = htonl(-1); /* an impossible id_num */ 82 invitation_waiting = 1; 83 announce_invite(); 84 /* 85 * Shut off the automatic messages for a while, 86 * so we can use the interupt timer to resend the invitation 87 */ 88 end_msgs(); 89 setitimer(ITIMER_REAL, &itimer, NULL); 90 message("Waiting for your party to respond"); 91 signal(SIGALRM, re_invite); 92 (void) setjmp(invitebuf); 93 while ((new_sockt = accept(sockt, 0, 0)) < 0) { 94 if (errno == EINTR) 95 continue; 96 p_error("Unable to connect with your party"); 97 } 98 close(sockt); 99 sockt = new_sockt; 100 101 /* 102 * Have the daemons delete the invitations now that we 103 * have connected. 104 */ 105 current_state = "Waiting for your party to respond"; 106 start_msgs(); 107 108 msg.id_num = htonl(local_id); 109 ctl_transact(my_machine_addr, msg, DELETE, &response); 110 msg.id_num = htonl(remote_id); 111 ctl_transact(his_machine_addr, msg, DELETE, &response); 112 invitation_waiting = 0; 113 } 114 115 /* 116 * Routine called on interupt to re-invite the callee 117 */ 118 /* ARGSUSED */ 119 void 120 re_invite(int signo __unused) 121 { 122 123 message("Ringing your party again"); 124 waddch(my_win.x_win, '\n'); 125 if (current_line < my_win.x_nlines - 1) 126 current_line++; 127 /* force a re-announce */ 128 msg.id_num = htonl(remote_id + 1); 129 announce_invite(); 130 longjmp(invitebuf, 1); 131 } 132 133 static const char *answers[] = { 134 "answer #0", /* SUCCESS */ 135 "Your party is not logged on", /* NOT_HERE */ 136 "Target machine is too confused to talk to us", /* FAILED */ 137 "Target machine does not recognize us", /* MACHINE_UNKNOWN */ 138 "Your party is refusing messages", /* PERMISSION_REFUSED */ 139 "Target machine can not handle remote talk", /* UNKNOWN_REQUEST */ 140 "Target machine indicates protocol mismatch", /* BADVERSION */ 141 "Target machine indicates protocol botch (addr)",/* BADADDR */ 142 "Target machine indicates protocol botch (ctl_addr)",/* BADCTLADDR */ 143 }; 144 #define NANSWERS (sizeof (answers) / sizeof (answers[0])) 145 146 /* 147 * Transmit the invitation and process the response 148 */ 149 void 150 announce_invite(void) 151 { 152 CTL_RESPONSE response; 153 154 current_state = "Trying to connect to your party's talk daemon"; 155 ctl_transact(his_machine_addr, msg, ANNOUNCE, &response); 156 remote_id = response.id_num; 157 if (response.answer != SUCCESS) { 158 if (response.answer < NANSWERS) 159 message(answers[response.answer]); 160 quit(); 161 } 162 /* leave the actual invitation on my talk daemon */ 163 current_state = "Trying to connect to local talk daemon"; 164 ctl_transact(my_machine_addr, msg, LEAVE_INVITE, &response); 165 local_id = response.id_num; 166 } 167 168 /* 169 * Tell the daemon to remove your invitation 170 */ 171 void 172 send_delete(void) 173 { 174 175 msg.type = DELETE; 176 /* 177 * This is just a extra clean up, so just send it 178 * and don't wait for an answer 179 */ 180 msg.id_num = htonl(remote_id); 181 daemon_addr.sin_addr = his_machine_addr; 182 if (sendto(ctl_sockt, &msg, sizeof (msg), 0, 183 (struct sockaddr *)&daemon_addr, 184 sizeof (daemon_addr)) != sizeof(msg)) 185 warn("send_delete (remote)"); 186 msg.id_num = htonl(local_id); 187 daemon_addr.sin_addr = my_machine_addr; 188 if (sendto(ctl_sockt, &msg, sizeof (msg), 0, 189 (struct sockaddr *)&daemon_addr, 190 sizeof (daemon_addr)) != sizeof (msg)) 191 warn("send_delete (local)"); 192 } 193