Annotation of src/usr.bin/talk/invite.c, Revision 1.2
1.1 deraadt 1: /* $NetBSD: invite.c,v 1.3 1994/12/09 02:14:18 jtc Exp $ */
2:
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. All advertising materials mentioning features or use of this software
16: * must display the following acknowledgement:
17: * This product includes software developed by the University of
18: * California, Berkeley and its contributors.
19: * 4. Neither the name of the University nor the names of its contributors
20: * may be used to endorse or promote products derived from this software
21: * without specific prior written permission.
22: *
23: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33: * SUCH DAMAGE.
34: */
35:
36: #ifndef lint
37: #if 0
38: static char sccsid[] = "@(#)invite.c 8.1 (Berkeley) 6/6/93";
39: #endif
40: static char rcsid[] = "$NetBSD: invite.c,v 1.3 1994/12/09 02:14:18 jtc Exp $";
41: #endif /* not lint */
42:
43: #include <sys/types.h>
44: #include <sys/socket.h>
45: #include <sys/time.h>
46: #include <signal.h>
47: #include <netinet/in.h>
48: #include <protocols/talkd.h>
49: #include <errno.h>
50: #include <setjmp.h>
51: #include "talk_ctl.h"
52: #include "talk.h"
53:
54: /*
55: * There wasn't an invitation waiting, so send a request containing
56: * our sockt address to the remote talk daemon so it can invite
57: * him
58: */
59:
60: /*
61: * The msg.id's for the invitations
62: * on the local and remote machines.
63: * These are used to delete the
64: * invitations.
65: */
66: int local_id, remote_id;
67: void re_invite();
68: jmp_buf invitebuf;
69:
70: invite_remote()
71: {
72: int nfd, read_mask, template, new_sockt;
73: struct itimerval itimer;
74: CTL_RESPONSE response;
75:
76: itimer.it_value.tv_sec = RING_WAIT;
77: itimer.it_value.tv_usec = 0;
78: itimer.it_interval = itimer.it_value;
79: if (listen(sockt, 5) != 0)
80: p_error("Error on attempt to listen for caller");
81: #ifdef MSG_EOR
82: /* copy new style sockaddr to old, swap family (short in old) */
83: msg.addr = *(struct osockaddr *)&my_addr; /* XXX new to old style*/
84: msg.addr.sa_family = htons(my_addr.sin_family);
85: #else
86: msg.addr = *(struct sockaddr *)&my_addr;
87: #endif
88: msg.id_num = htonl(-1); /* an impossible id_num */
89: invitation_waiting = 1;
90: announce_invite();
91: /*
92: * Shut off the automatic messages for a while,
93: * so we can use the interupt timer to resend the invitation
94: */
95: end_msgs();
96: setitimer(ITIMER_REAL, &itimer, (struct itimerval *)0);
97: message("Waiting for your party to respond");
98: signal(SIGALRM, re_invite);
99: (void) setjmp(invitebuf);
100: while ((new_sockt = accept(sockt, 0, 0)) < 0) {
101: if (errno == EINTR)
102: continue;
103: p_error("Unable to connect with your party");
104: }
105: close(sockt);
106: sockt = new_sockt;
107:
108: /*
109: * Have the daemons delete the invitations now that we
110: * have connected.
111: */
112: current_state = "Waiting for your party to respond";
113: start_msgs();
114:
115: msg.id_num = htonl(local_id);
116: ctl_transact(my_machine_addr, msg, DELETE, &response);
117: msg.id_num = htonl(remote_id);
118: ctl_transact(his_machine_addr, msg, DELETE, &response);
119: invitation_waiting = 0;
120: }
121:
122: /*
123: * Routine called on interupt to re-invite the callee
124: */
125: void
126: re_invite()
127: {
128:
129: message("Ringing your party again");
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: announce_invite()
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: ctl_transact(my_machine_addr, msg, LEAVE_INVITE, &response);
166: local_id = response.id_num;
167: }
168:
169: /*
170: * Tell the daemon to remove your invitation
171: */
172: send_delete()
173: {
174:
175: msg.type = DELETE;
176: /*
177: * This is just a extra clean up, so just send it
178: * and don't wait for an answer
179: */
180: msg.id_num = htonl(remote_id);
181: daemon_addr.sin_addr = his_machine_addr;
182: if (sendto(ctl_sockt, &msg, sizeof (msg), 0,
183: (struct sockaddr *)&daemon_addr,
184: sizeof (daemon_addr)) != sizeof(msg))
185: perror("send_delete (remote)");
186: msg.id_num = htonl(local_id);
187: daemon_addr.sin_addr = my_machine_addr;
188: if (sendto(ctl_sockt, &msg, sizeof (msg), 0,
189: (struct sockaddr *)&daemon_addr,
190: sizeof (daemon_addr)) != sizeof (msg))
191: perror("send_delete (local)");
192: }
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