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