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 static char sccsid[] = "@(#)invite.c 8.1 (Berkeley) 6/6/93"; 36 #endif /* not lint */ 37 38 #include <sys/types.h> 39 #include <sys/socket.h> 40 #include <sys/time.h> 41 #include <signal.h> 42 #include <netinet/in.h> 43 #include <protocols/talkd.h> 44 #include <errno.h> 45 #include <setjmp.h> 46 #include "talk_ctl.h" 47 #include "talk.h" 48 49 /* 50 * There wasn't an invitation waiting, so send a request containing 51 * our sockt address to the remote talk daemon so it can invite 52 * him 53 */ 54 55 /* 56 * The msg.id's for the invitations 57 * on the local and remote machines. 58 * These are used to delete the 59 * invitations. 60 */ 61 int local_id, remote_id; 62 jmp_buf invitebuf; 63 64 void 65 invite_remote() 66 { 67 int nfd, read_mask, template, new_sockt; 68 struct itimerval itimer; 69 CTL_RESPONSE response; 70 71 itimer.it_value.tv_sec = RING_WAIT; 72 itimer.it_value.tv_usec = 0; 73 itimer.it_interval = itimer.it_value; 74 if (listen(sockt, 5) != 0) 75 p_error("Error on attempt to listen for caller"); 76 #ifdef MSG_EOR 77 /* copy new style sockaddr to old, swap family (short in old) */ 78 msg.addr = *(struct osockaddr *)&my_addr; /* XXX new to old style*/ 79 msg.addr.sa_family = htons(my_addr.sin_family); 80 #else 81 msg.addr = *(struct sockaddr *)&my_addr; 82 #endif 83 msg.id_num = htonl(-1); /* an impossible id_num */ 84 invitation_waiting = 1; 85 announce_invite(); 86 /* 87 * Shut off the automatic messages for a while, 88 * so we can use the interupt timer to resend the invitation 89 */ 90 end_msgs(); 91 setitimer(ITIMER_REAL, &itimer, (struct itimerval *)0); 92 message("Waiting for your party to respond"); 93 signal(SIGALRM, re_invite); 94 (void) setjmp(invitebuf); 95 while ((new_sockt = accept(sockt, 0, 0)) < 0) { 96 if (errno == EINTR) 97 continue; 98 p_error("Unable to connect with your party"); 99 } 100 close(sockt); 101 sockt = new_sockt; 102 103 /* 104 * Have the daemons delete the invitations now that we 105 * have connected. 106 */ 107 current_state = "Waiting for your party to respond"; 108 start_msgs(); 109 110 msg.id_num = htonl(local_id); 111 ctl_transact(my_machine_addr, msg, DELETE, &response); 112 msg.id_num = htonl(remote_id); 113 ctl_transact(his_machine_addr, msg, DELETE, &response); 114 invitation_waiting = 0; 115 } 116 117 /* 118 * Routine called on interupt to re-invite the callee 119 */ 120 /* ARGSUSED */ 121 void 122 re_invite(signo) 123 int signo; 124 { 125 126 message("Ringing your party again"); 127 waddch(my_win.x_win, '\n'); 128 if (current_line < my_win.x_nlines - 1) 129 current_line++; 130 /* force a re-announce */ 131 msg.id_num = htonl(remote_id + 1); 132 announce_invite(); 133 longjmp(invitebuf, 1); 134 } 135 136 static char *answers[] = { 137 "answer #0", /* SUCCESS */ 138 "Your party is not logged on", /* NOT_HERE */ 139 "Target machine is too confused to talk to us", /* FAILED */ 140 "Target machine does not recognize us", /* MACHINE_UNKNOWN */ 141 "Your party is refusing messages", /* PERMISSION_REFUSED */ 142 "Target machine can not handle remote talk", /* UNKNOWN_REQUEST */ 143 "Target machine indicates protocol mismatch", /* BADVERSION */ 144 "Target machine indicates protocol botch (addr)",/* BADADDR */ 145 "Target machine indicates protocol botch (ctl_addr)",/* BADCTLADDR */ 146 }; 147 #define NANSWERS (sizeof (answers) / sizeof (answers[0])) 148 149 /* 150 * Transmit the invitation and process the response 151 */ 152 void 153 announce_invite() 154 { 155 CTL_RESPONSE response; 156 157 current_state = "Trying to connect to your party's talk daemon"; 158 ctl_transact(his_machine_addr, msg, ANNOUNCE, &response); 159 remote_id = response.id_num; 160 if (response.answer != SUCCESS) { 161 if (response.answer < NANSWERS) 162 message(answers[response.answer]); 163 quit(); 164 } 165 /* leave the actual invitation on my talk daemon */ 166 ctl_transact(my_machine_addr, msg, LEAVE_INVITE, &response); 167 local_id = response.id_num; 168 } 169 170 /* 171 * Tell the daemon to remove your invitation 172 */ 173 void 174 send_delete() 175 { 176 177 msg.type = DELETE; 178 /* 179 * This is just a extra clean up, so just send it 180 * and don't wait for an answer 181 */ 182 msg.id_num = htonl(remote_id); 183 daemon_addr.sin_addr = his_machine_addr; 184 if (sendto(ctl_sockt, &msg, sizeof (msg), 0, 185 (struct sockaddr *)&daemon_addr, 186 sizeof (daemon_addr)) != sizeof(msg)) 187 perror("send_delete (remote)"); 188 msg.id_num = htonl(local_id); 189 daemon_addr.sin_addr = my_machine_addr; 190 if (sendto(ctl_sockt, &msg, sizeof (msg), 0, 191 (struct sockaddr *)&daemon_addr, 192 sizeof (daemon_addr)) != sizeof (msg)) 193 perror("send_delete (local)"); 194 } 195