1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1983, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 #include <sys/cdefs.h>
33
34 __FBSDID("$FreeBSD$");
35
36 #ifndef lint
37 static const char sccsid[] = "@(#)invite.c 8.1 (Berkeley) 6/6/93";
38 #endif
39
40 #include <sys/types.h>
41 #include <sys/socket.h>
42 #include <protocols/talkd.h>
43
44 #include <err.h>
45 #include <errno.h>
46 #include <setjmp.h>
47 #include <signal.h>
48 #include <unistd.h>
49
50 #include "talk_ctl.h"
51 #include "talk.h"
52
53 /*
54 * There wasn't an invitation waiting, so send a request containing
55 * our sockt address to the remote talk daemon so it can invite
56 * him
57 */
58
59 /*
60 * The msg.id's for the invitations
61 * on the local and remote machines.
62 * These are used to delete the
63 * invitations.
64 */
65 static int local_id, remote_id;
66 static jmp_buf invitebuf;
67
68 void
invite_remote(void)69 invite_remote(void)
70 {
71 int new_sockt;
72 struct itimerval itimer;
73 CTL_RESPONSE response;
74
75 itimer.it_value.tv_sec = RING_WAIT;
76 itimer.it_value.tv_usec = 0;
77 itimer.it_interval = itimer.it_value;
78 if (listen(sockt, 5) != 0)
79 p_error("Error on attempt to listen for caller");
80 /* copy new style sockaddr to old, swap family (short in old) */
81 msg.addr = *(struct tsockaddr *)&my_addr;
82 msg.addr.sa_family = htons(my_addr.sin_family);
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 interrupt 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 interrupt to re-invite the callee
119 */
120 /* ARGSUSED */
121 void
re_invite(int signo __unused)122 re_invite(int signo __unused)
123 {
124
125 message("Ringing your party again");
126 waddch(my_win.x_win, '\n');
127 if (current_line < my_win.x_nlines - 1)
128 current_line++;
129 /* force a re-announce */
130 msg.id_num = htonl(remote_id + 1);
131 announce_invite();
132 longjmp(invitebuf, 1);
133 }
134
135 static const char *answers[] = {
136 "answer #0", /* SUCCESS */
137 "Your party is not logged on", /* NOT_HERE */
138 "Target machine is too confused to talk to us", /* FAILED */
139 "Target machine does not recognize us", /* MACHINE_UNKNOWN */
140 "Your party is refusing messages", /* PERMISSION_REFUSED */
141 "Target machine can not handle remote talk", /* UNKNOWN_REQUEST */
142 "Target machine indicates protocol mismatch", /* BADVERSION */
143 "Target machine indicates protocol botch (addr)",/* BADADDR */
144 "Target machine indicates protocol botch (ctl_addr)",/* BADCTLADDR */
145 };
146 #define NANSWERS (sizeof (answers) / sizeof (answers[0]))
147
148 /*
149 * Transmit the invitation and process the response
150 */
151 void
announce_invite(void)152 announce_invite(void)
153 {
154 CTL_RESPONSE response;
155
156 current_state = "Trying to connect to your party's talk daemon";
157 ctl_transact(his_machine_addr, msg, ANNOUNCE, &response);
158 remote_id = response.id_num;
159 if (response.answer != SUCCESS) {
160 if (response.answer < NANSWERS)
161 message(answers[response.answer]);
162 quit();
163 }
164 /* leave the actual invitation on my talk daemon */
165 current_state = "Trying to connect to local 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
send_delete(void)174 send_delete(void)
175 {
176
177 msg.type = DELETE;
178 /*
179 * This is just an 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 warn("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 warn("send_delete (local)");
194 }
195