1 /* $OpenBSD: invite.c,v 1.7 1999/03/03 20:43:30 millert Exp $ */ 2 /* $NetBSD: invite.c,v 1.3 1994/12/09 02:14:18 jtc Exp $ */ 3 4 /* 5 * Copyright (c) 1983, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 37 #ifndef lint 38 #if 0 39 static char sccsid[] = "@(#)invite.c 8.1 (Berkeley) 6/6/93"; 40 #endif 41 static char rcsid[] = "$OpenBSD: invite.c,v 1.7 1999/03/03 20:43:30 millert Exp $"; 42 #endif /* not lint */ 43 44 #include "talk.h" 45 #include <arpa/inet.h> 46 #include <sys/time.h> 47 #include <signal.h> 48 #include <netdb.h> 49 #include <errno.h> 50 #include <setjmp.h> 51 #include <unistd.h> 52 #include "talk_ctl.h" 53 54 #define STRING_LENGTH 158 55 56 /* 57 * There wasn't an invitation waiting, so send a request containing 58 * our sockt address to the remote talk daemon so it can invite 59 * him 60 */ 61 62 /* 63 * The msg.id's for the invitations 64 * on the local and remote machines. 65 * These are used to delete the 66 * invitations. 67 */ 68 int local_id, remote_id; 69 jmp_buf invitebuf; 70 71 void 72 invite_remote() 73 { 74 int new_sockt; 75 struct itimerval itimer; 76 CTL_RESPONSE response; 77 struct sockaddr rp; 78 int rplen = sizeof(struct sockaddr); 79 struct hostent *rphost; 80 char rname[STRING_LENGTH]; 81 82 itimer.it_value.tv_sec = RING_WAIT; 83 itimer.it_value.tv_usec = 0; 84 itimer.it_interval = itimer.it_value; 85 if (listen(sockt, 5) != 0) 86 quit("Error on attempt to listen for caller", 1); 87 #ifdef MSG_EOR 88 /* copy new style sockaddr to old, swap family (short in old) */ 89 msg.addr = *(struct osockaddr *)&my_addr; /* XXX new to old style*/ 90 msg.addr.sa_family = htons(my_addr.sin_family); 91 #else 92 msg.addr = *(struct sockaddr *)&my_addr; 93 #endif 94 msg.id_num = htonl(-1); /* an impossible id_num */ 95 invitation_waiting = 1; 96 announce_invite(); 97 /* 98 * Shut off the automatic messages for a while, 99 * so we can use the interrupt timer to resend the invitation. 100 * We no longer turn automatic messages back on to avoid a bonus 101 * message after we've connected; this is okay even though end_msgs() 102 * gets called again in main(). 103 */ 104 end_msgs(); 105 setitimer(ITIMER_REAL, &itimer, (struct itimerval *)0); 106 message("Waiting for your party to respond"); 107 signal(SIGALRM, re_invite); 108 (void) setjmp(invitebuf); 109 while ((new_sockt = accept(sockt, &rp, &rplen)) < 0) { 110 if (errno == EINTR) 111 continue; 112 quit("Unable to connect with your party", 1); 113 } 114 close(sockt); 115 sockt = new_sockt; 116 117 /* 118 * Have the daemons delete the invitations now that we 119 * have connected. 120 */ 121 msg.id_num = htonl(local_id); 122 ctl_transact(my_machine_addr, msg, DELETE, &response); 123 msg.id_num = htonl(remote_id); 124 ctl_transact(his_machine_addr, msg, DELETE, &response); 125 invitation_waiting = 0; 126 127 /* 128 * Check to see if the other guy is coming from the machine 129 * we expect. 130 */ 131 if (his_machine_addr.s_addr != 132 ((struct sockaddr_in *)&rp)->sin_addr.s_addr) { 133 rphost = gethostbyaddr((char *) &((struct sockaddr_in 134 *)&rp)->sin_addr, sizeof(struct in_addr), AF_INET); 135 if (rphost) 136 snprintf(rname, STRING_LENGTH, 137 "Answering talk request from %s@%s", msg.r_name, 138 rphost->h_name); 139 else 140 snprintf(rname, STRING_LENGTH, 141 "Answering talk request from %s@%s", msg.r_name, 142 inet_ntoa(((struct sockaddr_in *)&rp)->sin_addr)); 143 message(rname); 144 } 145 } 146 147 /* 148 * Routine called on interupt to re-invite the callee 149 */ 150 void 151 re_invite(dummy) 152 int dummy; 153 { 154 message("Ringing your party again"); 155 /* force a re-announce */ 156 msg.id_num = htonl(remote_id + 1); 157 announce_invite(); 158 longjmp(invitebuf, 1); 159 } 160 161 static char *answers[] = { 162 "answer #0", /* SUCCESS */ 163 "Your party is not logged on", /* NOT_HERE */ 164 "Target machine is too confused to talk to us", /* FAILED */ 165 "Target machine does not recognize us", /* MACHINE_UNKNOWN */ 166 "Your party is refusing messages", /* PERMISSION_REFUSED */ 167 "Target machine can not handle remote talk", /* UNKNOWN_REQUEST */ 168 "Target machine indicates protocol mismatch", /* BADVERSION */ 169 "Target machine indicates protocol botch (addr)",/* BADADDR */ 170 "Target machine indicates protocol botch (ctl_addr)",/* BADCTLADDR */ 171 }; 172 #define NANSWERS (sizeof (answers) / sizeof (answers[0])) 173 174 /* 175 * Transmit the invitation and process the response 176 */ 177 void 178 announce_invite() 179 { 180 CTL_RESPONSE response; 181 182 current_state = "Trying to connect to your party's talk daemon"; 183 ctl_transact(his_machine_addr, msg, ANNOUNCE, &response); 184 remote_id = response.id_num; 185 if (response.answer != SUCCESS) 186 quit(response.answer < NANSWERS ? answers[response.answer] : NULL, 0); 187 /* leave the actual invitation on my talk daemon */ 188 ctl_transact(my_machine_addr, msg, LEAVE_INVITE, &response); 189 local_id = response.id_num; 190 } 191 192 /* 193 * Tell the daemon to remove your invitation 194 */ 195 void 196 send_delete() 197 { 198 199 msg.type = DELETE; 200 /* 201 * This is just a extra clean up, so just send it 202 * and don't wait for an answer 203 */ 204 msg.id_num = htonl(remote_id); 205 daemon_addr.sin_addr = his_machine_addr; 206 if (sendto(ctl_sockt, &msg, sizeof (msg), 0, 207 (struct sockaddr *)&daemon_addr, 208 sizeof (daemon_addr)) != sizeof(msg)) 209 warn("send_delete (remote)"); 210 msg.id_num = htonl(local_id); 211 daemon_addr.sin_addr = my_machine_addr; 212 if (sendto(ctl_sockt, &msg, sizeof (msg), 0, 213 (struct sockaddr *)&daemon_addr, 214 sizeof (daemon_addr)) != sizeof (msg)) 215 warn("send_delete (local)"); 216 } 217