1 /* $OpenBSD: invite.c,v 1.8 2002/06/21 06:16:44 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 1.8 2002/06/21 06:16:44 millert Exp $"; 42 #endif /* not lint */ 43 44 #include "talk.h" 45 #include <arpa/inet.h> 46 #include <sys/time.h> 47 #include <netdb.h> 48 #include <errno.h> 49 #include <setjmp.h> 50 #include <unistd.h> 51 #include "talk_ctl.h" 52 53 #define STRING_LENGTH 158 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 */ 67 int local_id, remote_id; 68 jmp_buf invitebuf; 69 70 void 71 invite_remote() 72 { 73 int new_sockt; 74 struct itimerval itimer; 75 CTL_RESPONSE response; 76 struct sockaddr rp; 77 int rplen = sizeof(struct sockaddr); 78 struct hostent *rphost; 79 char rname[STRING_LENGTH]; 80 81 itimer.it_value.tv_sec = RING_WAIT; 82 itimer.it_value.tv_usec = 0; 83 itimer.it_interval = itimer.it_value; 84 if (listen(sockt, 5) != 0) 85 quit("Error on attempt to listen for caller", 1); 86 #ifdef MSG_EOR 87 /* copy new style sockaddr to old, swap family (short in old) */ 88 msg.addr = *(struct osockaddr *)&my_addr; /* XXX new to old style*/ 89 msg.addr.sa_family = htons(my_addr.sin_family); 90 #else 91 msg.addr = *(struct sockaddr *)&my_addr; 92 #endif 93 msg.id_num = htonl(-1); /* an impossible id_num */ 94 invitation_waiting = 1; 95 announce_invite(); 96 /* 97 * Shut off the automatic messages for a while, 98 * so we can use the interrupt timer to resend the invitation. 99 * We no longer turn automatic messages back on to avoid a bonus 100 * message after we've connected; this is okay even though end_msgs() 101 * gets called again in main(). 102 */ 103 end_msgs(); 104 setitimer(ITIMER_REAL, &itimer, (struct itimerval *)0); 105 message("Waiting for your party to respond"); 106 signal(SIGALRM, re_invite); 107 (void) setjmp(invitebuf); 108 while ((new_sockt = accept(sockt, &rp, &rplen)) < 0) { 109 if (errno == EINTR) 110 continue; 111 quit("Unable to connect with your party", 1); 112 } 113 close(sockt); 114 sockt = new_sockt; 115 116 /* 117 * Have the daemons delete the invitations now that we 118 * have connected. 119 */ 120 msg.id_num = htonl(local_id); 121 ctl_transact(my_machine_addr, msg, DELETE, &response); 122 msg.id_num = htonl(remote_id); 123 ctl_transact(his_machine_addr, msg, DELETE, &response); 124 invitation_waiting = 0; 125 126 /* 127 * Check to see if the other guy is coming from the machine 128 * we expect. 129 */ 130 if (his_machine_addr.s_addr != 131 ((struct sockaddr_in *)&rp)->sin_addr.s_addr) { 132 rphost = gethostbyaddr((char *) &((struct sockaddr_in 133 *)&rp)->sin_addr, sizeof(struct in_addr), AF_INET); 134 if (rphost) 135 snprintf(rname, STRING_LENGTH, 136 "Answering talk request from %s@%s", msg.r_name, 137 rphost->h_name); 138 else 139 snprintf(rname, STRING_LENGTH, 140 "Answering talk request from %s@%s", msg.r_name, 141 inet_ntoa(((struct sockaddr_in *)&rp)->sin_addr)); 142 message(rname); 143 } 144 } 145 146 /* 147 * Routine called on interupt to re-invite the callee 148 */ 149 void 150 re_invite(dummy) 151 int dummy; 152 { 153 message("Ringing your party again"); 154 /* force a re-announce */ 155 msg.id_num = htonl(remote_id + 1); 156 announce_invite(); 157 longjmp(invitebuf, 1); 158 } 159 160 static char *answers[] = { 161 "answer #0", /* SUCCESS */ 162 "Your party is not logged on", /* NOT_HERE */ 163 "Target machine is too confused to talk to us", /* FAILED */ 164 "Target machine does not recognize us", /* MACHINE_UNKNOWN */ 165 "Your party is refusing messages", /* PERMISSION_REFUSED */ 166 "Target machine can not handle remote talk", /* UNKNOWN_REQUEST */ 167 "Target machine indicates protocol mismatch", /* BADVERSION */ 168 "Target machine indicates protocol botch (addr)",/* BADADDR */ 169 "Target machine indicates protocol botch (ctl_addr)",/* BADCTLADDR */ 170 }; 171 #define NANSWERS (sizeof (answers) / sizeof (answers[0])) 172 173 /* 174 * Transmit the invitation and process the response 175 */ 176 void 177 announce_invite() 178 { 179 CTL_RESPONSE response; 180 181 current_state = "Trying to connect to your party's talk daemon"; 182 ctl_transact(his_machine_addr, msg, ANNOUNCE, &response); 183 remote_id = response.id_num; 184 if (response.answer != SUCCESS) 185 quit(response.answer < NANSWERS ? answers[response.answer] : NULL, 0); 186 /* leave the actual invitation on my talk daemon */ 187 ctl_transact(my_machine_addr, msg, LEAVE_INVITE, &response); 188 local_id = response.id_num; 189 } 190 191 /* 192 * Tell the daemon to remove your invitation 193 */ 194 void 195 send_delete() 196 { 197 198 msg.type = DELETE; 199 /* 200 * This is just a extra clean up, so just send it 201 * and don't wait for an answer 202 */ 203 msg.id_num = htonl(remote_id); 204 daemon_addr.sin_addr = his_machine_addr; 205 if (sendto(ctl_sockt, &msg, sizeof (msg), 0, 206 (struct sockaddr *)&daemon_addr, 207 sizeof (daemon_addr)) != sizeof(msg)) 208 warn("send_delete (remote)"); 209 msg.id_num = htonl(local_id); 210 daemon_addr.sin_addr = my_machine_addr; 211 if (sendto(ctl_sockt, &msg, sizeof (msg), 0, 212 (struct sockaddr *)&daemon_addr, 213 sizeof (daemon_addr)) != sizeof (msg)) 214 warn("send_delete (local)"); 215 } 216