invite.c revision 66682
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#ifndef lint 35#if 0 36static char sccsid[] = "@(#)invite.c 8.1 (Berkeley) 6/6/93"; 37#endif 38static const char rcsid[] = 39 "$FreeBSD: head/usr.bin/talk/invite.c 66682 2000-10-05 17:39:01Z ru $"; 40#endif /* not lint */ 41 42#include <err.h> 43#include <errno.h> 44#include <setjmp.h> 45#include <signal.h> 46#include <sys/types.h> 47#include <sys/socket.h> 48#include <protocols/talkd.h> 49#include "talk_ctl.h" 50#include "talk.h" 51 52/* 53 * There wasn't an invitation waiting, so send a request containing 54 * our sockt address to the remote talk daemon so it can invite 55 * him 56 */ 57 58/* 59 * The msg.id's for the invitations 60 * on the local and remote machines. 61 * These are used to delete the 62 * invitations. 63 */ 64int local_id, remote_id; 65jmp_buf invitebuf; 66 67void 68invite_remote() 69{ 70 int nfd, read_mask, template, new_sockt; 71 struct itimerval itimer; 72 CTL_RESPONSE response; 73 74 itimer.it_value.tv_sec = RING_WAIT; 75 itimer.it_value.tv_usec = 0; 76 itimer.it_interval = itimer.it_value; 77 if (listen(sockt, 5) != 0) 78 p_error("Error on attempt to listen for caller"); 79#ifdef MSG_EOR 80 /* copy new style sockaddr to old, swap family (short in old) */ 81 msg.addr = *(struct osockaddr *)&my_addr; /* XXX new to old style*/ 82 msg.addr.sa_family = htons(my_addr.sin_family); 83#else 84 msg.addr = *(struct sockaddr *)&my_addr; 85#endif 86 msg.id_num = htonl(-1); /* an impossible id_num */ 87 invitation_waiting = 1; 88 announce_invite(); 89 /* 90 * Shut off the automatic messages for a while, 91 * so we can use the interupt timer to resend the invitation 92 */ 93 end_msgs(); 94 setitimer(ITIMER_REAL, &itimer, (struct itimerval *)0); 95 message("Waiting for your party to respond"); 96 signal(SIGALRM, re_invite); 97 (void) setjmp(invitebuf); 98 while ((new_sockt = accept(sockt, 0, 0)) < 0) { 99 if (errno == EINTR) 100 continue; 101 p_error("Unable to connect with your party"); 102 } 103 close(sockt); 104 sockt = new_sockt; 105 106 /* 107 * Have the daemons delete the invitations now that we 108 * have connected. 109 */ 110 current_state = "Waiting for your party to respond"; 111 start_msgs(); 112 113 msg.id_num = htonl(local_id); 114 ctl_transact(my_machine_addr, msg, DELETE, &response); 115 msg.id_num = htonl(remote_id); 116 ctl_transact(his_machine_addr, msg, DELETE, &response); 117 invitation_waiting = 0; 118} 119 120/* 121 * Routine called on interupt to re-invite the callee 122 */ 123/* ARGSUSED */ 124void 125re_invite(signo) 126 int signo; 127{ 128 129 message("Ringing your party again"); 130 waddch(my_win.x_win, '\n'); 131 if (current_line < my_win.x_nlines - 1) 132 current_line++; 133 /* force a re-announce */ 134 msg.id_num = htonl(remote_id + 1); 135 announce_invite(); 136 longjmp(invitebuf, 1); 137} 138 139static char *answers[] = { 140 "answer #0", /* SUCCESS */ 141 "Your party is not logged on", /* NOT_HERE */ 142 "Target machine is too confused to talk to us", /* FAILED */ 143 "Target machine does not recognize us", /* MACHINE_UNKNOWN */ 144 "Your party is refusing messages", /* PERMISSION_REFUSED */ 145 "Target machine can not handle remote talk", /* UNKNOWN_REQUEST */ 146 "Target machine indicates protocol mismatch", /* BADVERSION */ 147 "Target machine indicates protocol botch (addr)",/* BADADDR */ 148 "Target machine indicates protocol botch (ctl_addr)",/* BADCTLADDR */ 149}; 150#define NANSWERS (sizeof (answers) / sizeof (answers[0])) 151 152/* 153 * Transmit the invitation and process the response 154 */ 155void 156announce_invite() 157{ 158 CTL_RESPONSE response; 159 160 current_state = "Trying to connect to your party's talk daemon"; 161 ctl_transact(his_machine_addr, msg, ANNOUNCE, &response); 162 remote_id = response.id_num; 163 if (response.answer != SUCCESS) { 164 if (response.answer < NANSWERS) 165 message(answers[response.answer]); 166 quit(); 167 } 168 /* leave the actual invitation on my talk daemon */ 169 current_state = "Trying to connect to local talk daemon"; 170 ctl_transact(my_machine_addr, msg, LEAVE_INVITE, &response); 171 local_id = response.id_num; 172} 173 174/* 175 * Tell the daemon to remove your invitation 176 */ 177void 178send_delete() 179{ 180 181 msg.type = DELETE; 182 /* 183 * This is just a extra clean up, so just send it 184 * and don't wait for an answer 185 */ 186 msg.id_num = htonl(remote_id); 187 daemon_addr.sin_addr = his_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 (remote)"); 192 msg.id_num = htonl(local_id); 193 daemon_addr.sin_addr = my_machine_addr; 194 if (sendto(ctl_sockt, &msg, sizeof (msg), 0, 195 (struct sockaddr *)&daemon_addr, 196 sizeof (daemon_addr)) != sizeof (msg)) 197 warn("send_delete (local)"); 198} 199