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984263bc MD |
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. | |
1de703da MD |
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 $ | |
984263bc MD |
35 | */ |
36 | ||
800c4f63 | 37 | #include <sys/param.h> |
984263bc MD |
38 | #include <sys/socket.h> |
39 | #include <protocols/talkd.h> | |
800c4f63 | 40 | #include <errno.h> |
984263bc MD |
41 | #include "talk_ctl.h" |
42 | #include "talk.h" | |
43 | ||
44 | /* | |
45 | * See if the local daemon has an invitation for us. | |
46 | */ | |
47 | int | |
1d1731fa | 48 | check_local(void) |
984263bc MD |
49 | { |
50 | CTL_RESPONSE response; | |
815943a9 | 51 | CTL_RESPONSE *rp = &response; |
984263bc MD |
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 | */ | |
97 | int | |
1d1731fa | 98 | look_for_invite(CTL_RESPONSE *rp) |
984263bc | 99 | { |
984263bc MD |
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 | } |