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 * $DragonFly: src/usr.bin/talk/invite.c,v 1.4 2004/08/19 23:32:02 joerg Exp $ 36 */ 37 38 #include <sys/param.h> 39 #include <sys/socket.h> 40 #include <err.h> 41 #include <errno.h> 42 #include <setjmp.h> 43 #include <signal.h> 44 #include <protocols/talkd.h> 45 #include "talk_ctl.h" 46 #include "talk.h" 47 48 /* 49 * There wasn't an invitation waiting, so send a request containing 50 * our sockt address to the remote talk daemon so it can invite 51 * him 52 */ 53 54 /* 55 * The msg.id's for the invitations 56 * on the local and remote machines. 57 * These are used to delete the 58 * invitations. 59 */ 60 int local_id, remote_id; 61 jmp_buf invitebuf; 62 63 void 64 invite_remote(void) 65 { 66 int nfd, read_mask, template, new_sockt; 67 struct itimerval itimer; 68 CTL_RESPONSE response; 69 70 itimer.it_value.tv_sec = RING_WAIT; 71 itimer.it_value.tv_usec = 0; 72 itimer.it_interval = itimer.it_value; 73 if (listen(sockt, 5) != 0) 74 p_error("Error on attempt to listen for caller"); 75 #ifdef MSG_EOR 76 /* copy new style sockaddr to old, swap family (short in old) */ 77 msg.addr = *(struct osockaddr *)&my_addr; /* XXX new to old style*/ 78 msg.addr.sa_family = htons(my_addr.sin_family); 79 #else 80 msg.addr = *(struct sockaddr *)&my_addr; 81 #endif 82 msg.id_num = htonl(-1); /* an impossible id_num */ 83 invitation_waiting = 1; 84 announce_invite(); 85 /* 86 * Shut off the automatic messages for a while, 87 * so we can use the interupt timer to resend the invitation 88 */ 89 end_msgs(); 90 setitimer(ITIMER_REAL, &itimer, (struct itimerval *)0); 91 message("Waiting for your party to respond"); 92 signal(SIGALRM, re_invite); 93 (void) setjmp(invitebuf); 94 while ((new_sockt = accept(sockt, 0, 0)) < 0) { 95 if (errno == EINTR) 96 continue; 97 p_error("Unable to connect with your party"); 98 } 99 close(sockt); 100 sockt = new_sockt; 101 102 /* 103 * Have the daemons delete the invitations now that we 104 * have connected. 105 */ 106 current_state = "Waiting for your party to respond"; 107 start_msgs(); 108 109 msg.id_num = htonl(local_id); 110 ctl_transact(my_machine_addr, msg, DELETE, &response); 111 msg.id_num = htonl(remote_id); 112 ctl_transact(his_machine_addr, msg, DELETE, &response); 113 invitation_waiting = 0; 114 } 115 116 /* 117 * Routine called on interupt to re-invite the callee 118 */ 119 /* ARGSUSED */ 120 void 121 re_invite(int signo) 122 { 123 124 message("Ringing your party again"); 125 waddch(my_win.x_win, '\n'); 126 if (current_line < my_win.x_nlines - 1) 127 current_line++; 128 /* force a re-announce */ 129 msg.id_num = htonl(remote_id + 1); 130 announce_invite(); 131 longjmp(invitebuf, 1); 132 } 133 134 static char *answers[] = { 135 "answer #0", /* SUCCESS */ 136 "Your party is not logged on", /* NOT_HERE */ 137 "Target machine is too confused to talk to us", /* FAILED */ 138 "Target machine does not recognize us", /* MACHINE_UNKNOWN */ 139 "Your party is refusing messages", /* PERMISSION_REFUSED */ 140 "Target machine can not handle remote talk", /* UNKNOWN_REQUEST */ 141 "Target machine indicates protocol mismatch", /* BADVERSION */ 142 "Target machine indicates protocol botch (addr)",/* BADADDR */ 143 "Target machine indicates protocol botch (ctl_addr)",/* BADCTLADDR */ 144 }; 145 #define NANSWERS (sizeof (answers) / sizeof (answers[0])) 146 147 /* 148 * Transmit the invitation and process the response 149 */ 150 void 151 announce_invite(void) 152 { 153 CTL_RESPONSE response; 154 155 current_state = "Trying to connect to your party's talk daemon"; 156 ctl_transact(his_machine_addr, msg, ANNOUNCE, &response); 157 remote_id = response.id_num; 158 if (response.answer != SUCCESS) { 159 if (response.answer < NANSWERS) 160 message(answers[response.answer]); 161 quit(); 162 } 163 /* leave the actual invitation on my talk daemon */ 164 current_state = "Trying to connect to local talk daemon"; 165 ctl_transact(my_machine_addr, msg, LEAVE_INVITE, &response); 166 local_id = response.id_num; 167 } 168 169 /* 170 * Tell the daemon to remove your invitation 171 */ 172 void 173 send_delete(void) 174 { 175 176 msg.type = DELETE; 177 /* 178 * This is just a extra clean up, so just send it 179 * and don't wait for an answer 180 */ 181 msg.id_num = htonl(remote_id); 182 daemon_addr.sin_addr = his_machine_addr; 183 if (sendto(ctl_sockt, &msg, sizeof (msg), 0, 184 (struct sockaddr *)&daemon_addr, 185 sizeof (daemon_addr)) != sizeof(msg)) 186 warn("send_delete (remote)"); 187 msg.id_num = htonl(local_id); 188 daemon_addr.sin_addr = my_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 (local)"); 193 } 194