talk(1): Raise WARNS to 6 and fix warnings.
[dragonfly.git] / usr.bin / talk / look_up.c
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1/*
2 * Copyright (c) 1983, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
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32 *
33 * @(#)look_up.c 8.1 (Berkeley) 6/6/93
34 * $FreeBSD: src/usr.bin/talk/look_up.c,v 1.5 1999/08/28 01:06:14 peter Exp $
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35 */
36
800c4f63 37#include <sys/param.h>
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38#include <sys/socket.h>
39#include <protocols/talkd.h>
800c4f63 40#include <errno.h>
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41#include "talk_ctl.h"
42#include "talk.h"
43
44/*
45 * See if the local daemon has an invitation for us.
46 */
47int
1d1731fa 48check_local(void)
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49{
50 CTL_RESPONSE response;
815943a9 51 CTL_RESPONSE *rp = &response;
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52
53 /* the rest of msg was set up in get_names */
54#ifdef MSG_EOR
55 /* copy new style sockaddr to old, swap family (short in old) */
56 msg.ctl_addr = *(struct osockaddr *)&ctl_addr;
57 msg.ctl_addr.sa_family = htons(ctl_addr.sin_family);
58#else
59 msg.ctl_addr = *(struct sockaddr *)&ctl_addr;
60#endif
61 /* must be initiating a talk */
62 if (!look_for_invite(rp))
63 return (0);
64 /*
65 * There was an invitation waiting for us,
66 * so connect with the other (hopefully waiting) party
67 */
68 current_state = "Waiting to connect with caller";
69 do {
70 if (rp->addr.sa_family != AF_INET)
71 p_error("Response uses invalid network address");
72 errno = 0;
73 if (connect(sockt,
74 (struct sockaddr *)&rp->addr, sizeof (rp->addr)) != -1)
75 return (1);
76 } while (errno == EINTR);
77 if (errno == ECONNREFUSED) {
78 /*
79 * The caller gave up, but his invitation somehow
80 * was not cleared. Clear it and initiate an
81 * invitation. (We know there are no newer invitations,
82 * the talkd works LIFO.)
83 */
84 ctl_transact(his_machine_addr, msg, DELETE, rp);
85 close(sockt);
86 open_sockt();
87 return (0);
88 }
89 p_error("Unable to connect with initiator");
90 /*NOTREACHED*/
91 return (0);
92}
93
94/*
95 * Look for an invitation on 'machine'
96 */
97int
1d1731fa 98look_for_invite(CTL_RESPONSE *rp)
984263bc 99{
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100 current_state = "Checking for invitation on caller's machine";
101 ctl_transact(his_machine_addr, msg, LOOK_UP, rp);
102 /* the switch is for later options, such as multiple invitations */
103 switch (rp->answer) {
104
105 case SUCCESS:
106 msg.id_num = htonl(rp->id_num);
107 return (1);
108
109 default:
110 /* there wasn't an invitation waiting for us */
111 return (0);
112 }
113}