invite.c revision 200418
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: head/usr.bin/talk/invite.c 200418 2009-12-11 23:23:57Z delphij $"); 37 38#ifndef lint 39static 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#include <unistd.h> 51 52#include "talk_ctl.h" 53#include "talk.h" 54 55/* 56 * There wasn't an invitation waiting, so send a request containing 57 * our sockt address to the remote talk daemon so it can invite 58 * him 59 */ 60 61/* 62 * The msg.id's for the invitations 63 * on the local and remote machines. 64 * These are used to delete the 65 * invitations. 66 */ 67int local_id, remote_id; 68jmp_buf invitebuf; 69 70void 71invite_remote(void) 72{ 73 int new_sockt; 74 struct itimerval itimer; 75 CTL_RESPONSE response; 76 77 itimer.it_value.tv_sec = RING_WAIT; 78 itimer.it_value.tv_usec = 0; 79 itimer.it_interval = itimer.it_value; 80 if (listen(sockt, 5) != 0) 81 p_error("Error on attempt to listen for caller"); 82#ifdef MSG_EOR 83 /* copy new style sockaddr to old, swap family (short in old) */ 84 msg.addr = *(struct osockaddr *)&my_addr; /* XXX new to old style*/ 85 msg.addr.sa_family = htons(my_addr.sin_family); 86#else 87 msg.addr = *(struct sockaddr *)&my_addr; 88#endif 89 msg.id_num = htonl(-1); /* an impossible id_num */ 90 invitation_waiting = 1; 91 announce_invite(); 92 /* 93 * Shut off the automatic messages for a while, 94 * so we can use the interupt timer to resend the invitation 95 */ 96 end_msgs(); 97 setitimer(ITIMER_REAL, &itimer, (struct itimerval *)0); 98 message("Waiting for your party to respond"); 99 signal(SIGALRM, re_invite); 100 (void) setjmp(invitebuf); 101 while ((new_sockt = accept(sockt, 0, 0)) < 0) { 102 if (errno == EINTR) 103 continue; 104 p_error("Unable to connect with your party"); 105 } 106 close(sockt); 107 sockt = new_sockt; 108 109 /* 110 * Have the daemons delete the invitations now that we 111 * have connected. 112 */ 113 current_state = "Waiting for your party to respond"; 114 start_msgs(); 115 116 msg.id_num = htonl(local_id); 117 ctl_transact(my_machine_addr, msg, DELETE, &response); 118 msg.id_num = htonl(remote_id); 119 ctl_transact(his_machine_addr, msg, DELETE, &response); 120 invitation_waiting = 0; 121} 122 123/* 124 * Routine called on interupt to re-invite the callee 125 */ 126/* ARGSUSED */ 127void 128re_invite(int signo __unused) 129{ 130 131 message("Ringing your party again"); 132 waddch(my_win.x_win, '\n'); 133 if (current_line < my_win.x_nlines - 1) 134 current_line++; 135 /* force a re-announce */ 136 msg.id_num = htonl(remote_id + 1); 137 announce_invite(); 138 longjmp(invitebuf, 1); 139} 140 141static const char *answers[] = { 142 "answer #0", /* SUCCESS */ 143 "Your party is not logged on", /* NOT_HERE */ 144 "Target machine is too confused to talk to us", /* FAILED */ 145 "Target machine does not recognize us", /* MACHINE_UNKNOWN */ 146 "Your party is refusing messages", /* PERMISSION_REFUSED */ 147 "Target machine can not handle remote talk", /* UNKNOWN_REQUEST */ 148 "Target machine indicates protocol mismatch", /* BADVERSION */ 149 "Target machine indicates protocol botch (addr)",/* BADADDR */ 150 "Target machine indicates protocol botch (ctl_addr)",/* BADCTLADDR */ 151}; 152#define NANSWERS (sizeof (answers) / sizeof (answers[0])) 153 154/* 155 * Transmit the invitation and process the response 156 */ 157void 158announce_invite(void) 159{ 160 CTL_RESPONSE response; 161 162 current_state = "Trying to connect to your party's talk daemon"; 163 ctl_transact(his_machine_addr, msg, ANNOUNCE, &response); 164 remote_id = response.id_num; 165 if (response.answer != SUCCESS) { 166 if (response.answer < NANSWERS) 167 message(answers[response.answer]); 168 quit(); 169 } 170 /* leave the actual invitation on my talk daemon */ 171 current_state = "Trying to connect to local talk daemon"; 172 ctl_transact(my_machine_addr, msg, LEAVE_INVITE, &response); 173 local_id = response.id_num; 174} 175 176/* 177 * Tell the daemon to remove your invitation 178 */ 179void 180send_delete(void) 181{ 182 183 msg.type = DELETE; 184 /* 185 * This is just an extra clean up, so just send it 186 * and don't wait for an answer 187 */ 188 msg.id_num = htonl(remote_id); 189 daemon_addr.sin_addr = his_machine_addr; 190 if (sendto(ctl_sockt, &msg, sizeof (msg), 0, 191 (struct sockaddr *)&daemon_addr, 192 sizeof (daemon_addr)) != sizeof(msg)) 193 warn("send_delete (remote)"); 194 msg.id_num = htonl(local_id); 195 daemon_addr.sin_addr = my_machine_addr; 196 if (sendto(ctl_sockt, &msg, sizeof (msg), 0, 197 (struct sockaddr *)&daemon_addr, 198 sizeof (daemon_addr)) != sizeof (msg)) 199 warn("send_delete (local)"); 200} 201