1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License, Version 1.0 only
6 * (the "License").  You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22/*
23 * Copyright 2000 Sun Microsystems, Inc.  All rights reserved.
24 * Use is subject to license terms.
25 */
26
27/*	Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T	*/
28/*	  All Rights Reserved  	*/
29
30/*
31 * University Copyright- Copyright (c) 1982, 1986, 1988
32 * The Regents of the University of California
33 * All Rights Reserved
34 *
35 * University Acknowledgment- Portions of this document are derived from
36 * software developed by the University of California, Berkeley, and its
37 * contributors.
38 */
39
40#pragma ident	"%Z%%M%	%I%	%E% SMI"
41
42#include "talk_ctl.h"
43#include <libintl.h>
44#include <sys/isa_defs.h>
45
46#ifdef SYSV
47#define	bcopy(a, b, c)	memcpy((b), (a), (c))
48#endif /* SYSV */
49
50static int look_for_invite(CTL_RESPONSE *);
51static CTL_RESPONSE swapresponse();
52
53
54	/* see if the local daemon has a invitation for us */
55
56int
57check_local()
58{
59	CTL_RESPONSE response;
60
61	/* the rest of msg was set up in get_names */
62
63	msg.ctl_addr = ctl_addr;
64
65	if (!look_for_invite(&response)) {
66
67		/* we must be initiating a talk */
68
69		return (0);
70	}
71
72	/*
73	 * there was an invitation waiting for us,
74	 * so connect with the other (hopefully waiting) party
75	 */
76
77	current_state = gettext("Waiting to connect with caller");
78
79	response = swapresponse(response);
80	while (connect(sockt, (struct sockaddr *)&response.addr,
81		sizeof (response.addr)) != 0) {
82		if (errno == ECONNREFUSED) {
83
84			/*
85			 * the caller gave up, but the invitation somehow
86			 * was not cleared. Clear it and initiate an
87			 * invitation. (We know there are no newer invitations,
88			 * the talkd works LIFO.)
89			 */
90
91			ctl_transact(rem_machine_addr, msg, DELETE, &response);
92			close(sockt);
93			open_sockt();
94			return (0);
95		} else if (errno == EINTR) {
96
97		/* we have returned from an interupt handler */
98			continue;
99		} else {
100			p_error(gettext("Unable to connect with initiator"));
101		}
102	}
103
104	return (1);
105}
106
107	/* look for an invitation on 'machine' */
108
109static int
110look_for_invite(response)
111CTL_RESPONSE *response;
112{
113	current_state = gettext("Checking for invitation on caller's machine");
114
115	ctl_transact(rem_machine_addr, msg, LOOK_UP, response);
116
117	/*
118	 * switch is for later options, such as multiple invitations
119	 */
120
121	switch (response->answer) {
122
123	case SUCCESS:
124
125		msg.id_num = response->id_num;
126		return (1);
127
128	default :
129		/* there wasn't an invitation waiting for us */
130		return (0);
131	}
132}
133
134/*
135 * heuristic to detect if need to reshuffle CTL_RESPONSE structure
136 */
137
138#if defined(_LITTLE_ENDIAN)
139struct ctl_response_runrise {
140	char type;
141	char answer;
142	short junk;
143	int id_num;
144	struct sockaddr_in addr;
145};
146
147static CTL_RESPONSE
148swapresponse(rsp)
149	CTL_RESPONSE rsp;
150{
151	struct ctl_response_runrise swaprsp;
152
153	if (rsp.addr.sin_family != AF_INET) {
154		bcopy(&rsp, &swaprsp, sizeof (CTL_RESPONSE));
155		if (swaprsp.addr.sin_family == AF_INET) {
156			rsp.addr = swaprsp.addr;
157			rsp.type = swaprsp.type;
158			rsp.answer = swaprsp.answer;
159			rsp.id_num = swaprsp.id_num;
160		}
161	}
162	return (rsp);
163}
164#endif
165
166#if defined(_BIG_ENDIAN)
167struct ctl_response_sun3 {
168	char type;
169	char answer;
170	unsigned short id_num2;
171	unsigned short id_num1;
172	short sin_family;
173	short sin_port;
174	short sin_addr2;
175	short sin_addr1;
176};
177
178static CTL_RESPONSE
179swapresponse(rsp)
180	CTL_RESPONSE rsp;
181{
182	struct ctl_response_sun3 swaprsp;
183
184	if (rsp.addr.sin_family != AF_INET) {
185		bcopy(&rsp, &swaprsp, sizeof (struct ctl_response_sun3));
186		if (swaprsp.sin_family == AF_INET) {
187			rsp.type = swaprsp.type;
188			rsp.answer = swaprsp.answer;
189			rsp.id_num = swaprsp.id_num1
190				| (swaprsp.id_num2 << 16);
191			rsp.addr.sin_family = swaprsp.sin_family;
192			rsp.addr.sin_port = swaprsp.sin_port;
193			rsp.addr.sin_addr.s_addr =
194				(swaprsp.sin_addr2 << 16)| swaprsp.sin_addr1;
195		}
196	}
197	return (rsp);
198}
199#endif
200