Annotation of src/usr.bin/talk/look_up.c, Revision 1.1.1.1
1.1 deraadt 1: /* $NetBSD: look_up.c,v 1.3 1994/12/09 02:14:21 jtc Exp $ */
2:
3: /*
4: * Copyright (c) 1983, 1993
5: * The Regents of the University of California. All rights reserved.
6: *
7: * Redistribution and use in source and binary forms, with or without
8: * modification, are permitted provided that the following conditions
9: * are met:
10: * 1. Redistributions of source code must retain the above copyright
11: * notice, this list of conditions and the following disclaimer.
12: * 2. Redistributions in binary form must reproduce the above copyright
13: * notice, this list of conditions and the following disclaimer in the
14: * documentation and/or other materials provided with the distribution.
15: * 3. All advertising materials mentioning features or use of this software
16: * must display the following acknowledgement:
17: * This product includes software developed by the University of
18: * California, Berkeley and its contributors.
19: * 4. Neither the name of the University nor the names of its contributors
20: * may be used to endorse or promote products derived from this software
21: * without specific prior written permission.
22: *
23: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33: * SUCH DAMAGE.
34: */
35:
36: #ifndef lint
37: #if 0
38: static char sccsid[] = "@(#)look_up.c 8.1 (Berkeley) 6/6/93";
39: #endif
40: static char rcsid[] = "$NetBSD: look_up.c,v 1.3 1994/12/09 02:14:21 jtc Exp $";
41: #endif /* not lint */
42:
43: #include <sys/types.h>
44: #include <sys/socket.h>
45: #include <netinet/in.h>
46: #include <protocols/talkd.h>
47: #include <errno.h>
48: #include "talk_ctl.h"
49: #include "talk.h"
50:
51: /*
52: * See if the local daemon has an invitation for us.
53: */
54: check_local()
55: {
56: CTL_RESPONSE response;
57: register CTL_RESPONSE *rp = &response;
58:
59: /* the rest of msg was set up in get_names */
60: #ifdef MSG_EOR
61: /* copy new style sockaddr to old, swap family (short in old) */
62: msg.ctl_addr = *(struct osockaddr *)&ctl_addr;
63: msg.ctl_addr.sa_family = htons(ctl_addr.sin_family);
64: #else
65: msg.ctl_addr = *(struct sockaddr *)&ctl_addr;
66: #endif
67: /* must be initiating a talk */
68: if (!look_for_invite(rp))
69: return (0);
70: /*
71: * There was an invitation waiting for us,
72: * so connect with the other (hopefully waiting) party
73: */
74: current_state = "Waiting to connect with caller";
75: do {
76: if (rp->addr.sa_family != AF_INET)
77: p_error("Response uses invalid network address");
78: errno = 0;
79: if (connect(sockt,
80: (struct sockaddr *)&rp->addr, sizeof (rp->addr)) != -1)
81: return (1);
82: } while (errno == EINTR);
83: if (errno == ECONNREFUSED) {
84: /*
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.)
89: */
90: ctl_transact(his_machine_addr, msg, DELETE, rp);
91: close(sockt);
92: open_sockt();
93: return (0);
94: }
95: p_error("Unable to connect with initiator");
96: /*NOTREACHED*/
97: }
98:
99: /*
100: * Look for an invitation on 'machine'
101: */
102: look_for_invite(rp)
103: CTL_RESPONSE *rp;
104: {
105: struct in_addr machine_addr;
106:
107: current_state = "Checking for invitation on caller's machine";
108: ctl_transact(his_machine_addr, msg, LOOK_UP, rp);
109: /* the switch is for later options, such as multiple invitations */
110: switch (rp->answer) {
111:
112: case SUCCESS:
113: msg.id_num = htonl(rp->id_num);
114: return (1);
115:
116: default:
117: /* there wasn't an invitation waiting for us */
118: return (0);
119: }
120: }