2 * Copyright (c) 1983, 1993
3 * The Regents of the University of California. All rights reserved.
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6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
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14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
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19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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29 * @(#)look_up.c 8.1 (Berkeley) 6/6/93
30 * $FreeBSD: src/usr.bin/talk/look_up.c,v 1.5 1999/08/28 01:06:14 peter Exp $
33 #include <sys/param.h>
34 #include <sys/socket.h>
35 #include <protocols/talkd.h>
36 #include <netinet/in.h>
43 * See if the local daemon has an invitation for us.
48 CTL_RESPONSE response
;
49 CTL_RESPONSE
*rp
= &response
;
51 /* the rest of msg was set up in get_names */
53 /* copy new style sockaddr to old, swap family (short in old) */
54 msg
.ctl_addr
= *(struct osockaddr
*)&ctl_addr
;
55 msg
.ctl_addr
.sa_family
= htons(ctl_addr
.sin_family
);
57 msg
.ctl_addr
= *(struct sockaddr
*)&ctl_addr
;
59 /* must be initiating a talk */
60 if (!look_for_invite(rp
))
63 * There was an invitation waiting for us,
64 * so connect with the other (hopefully waiting) party
66 current_state
= "Waiting to connect with caller";
68 struct sockaddr_in addr
;
69 struct sockaddr_in
*raddr
;
71 if (rp
->addr
.sa_family
!= AF_INET
)
72 p_error("Response uses invalid network address");
73 raddr
= (struct sockaddr_in
*)&rp
->addr
;
74 memset(&addr
, 0, sizeof(addr
));
75 addr
.sin_family
= AF_INET
;
76 addr
.sin_port
= raddr
->sin_port
;
77 addr
.sin_addr
= raddr
->sin_addr
;
80 (struct sockaddr
*)&addr
, sizeof(addr
)) != -1)
82 } while (errno
== EINTR
);
83 if (errno
== ECONNREFUSED
) {
85 * The caller gave up, but his 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.)
90 ctl_transact(his_machine_addr
, msg
, DELETE
, rp
);
95 p_error("Unable to connect with initiator");
101 * Look for an invitation on 'machine'
104 look_for_invite(CTL_RESPONSE
*rp
)
106 current_state
= "Checking for invitation on caller's machine";
107 ctl_transact(his_machine_addr
, msg
, LOOK_UP
, rp
);
108 /* the switch is for later options, such as multiple invitations */
109 switch (rp
->answer
) {
112 msg
.id_num
= htonl(rp
->id_num
);
116 /* there wasn't an invitation waiting for us */