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
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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.
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30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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 $
35 * $DragonFly: src/usr.bin/talk/look_up.c,v 1.5 2008/10/16 01:52:33 swildner Exp $
38 #include <sys/param.h>
39 #include <sys/socket.h>
40 #include <protocols/talkd.h>
46 * See if the local daemon has an invitation for us.
51 CTL_RESPONSE response
;
52 CTL_RESPONSE
*rp
= &response
;
54 /* the rest of msg was set up in get_names */
56 /* copy new style sockaddr to old, swap family (short in old) */
57 msg
.ctl_addr
= *(struct osockaddr
*)&ctl_addr
;
58 msg
.ctl_addr
.sa_family
= htons(ctl_addr
.sin_family
);
60 msg
.ctl_addr
= *(struct sockaddr
*)&ctl_addr
;
62 /* must be initiating a talk */
63 if (!look_for_invite(rp
))
66 * There was an invitation waiting for us,
67 * so connect with the other (hopefully waiting) party
69 current_state
= "Waiting to connect with caller";
71 if (rp
->addr
.sa_family
!= AF_INET
)
72 p_error("Response uses invalid network address");
75 (struct sockaddr
*)&rp
->addr
, sizeof (rp
->addr
)) != -1)
77 } while (errno
== EINTR
);
78 if (errno
== ECONNREFUSED
) {
80 * The caller gave up, but his invitation somehow
81 * was not cleared. Clear it and initiate an
82 * invitation. (We know there are no newer invitations,
83 * the talkd works LIFO.)
85 ctl_transact(his_machine_addr
, msg
, DELETE
, rp
);
90 p_error("Unable to connect with initiator");
96 * Look for an invitation on 'machine'
99 look_for_invite(CTL_RESPONSE
*rp
)
101 struct in_addr machine_addr
;
103 current_state
= "Checking for invitation on caller's machine";
104 ctl_transact(his_machine_addr
, msg
, LOOK_UP
, rp
);
105 /* the switch is for later options, such as multiple invitations */
106 switch (rp
->answer
) {
109 msg
.id_num
= htonl(rp
->id_num
);
113 /* there wasn't an invitation waiting for us */