Annotation of src/usr.bin/talk/look_up.c, Revision 1.6
1.6 ! millert 1: /* $OpenBSD: look_up.c,v 1.5 1998/08/18 04:02:18 millert Exp $ */
1.1 deraadt 2: /* $NetBSD: look_up.c,v 1.3 1994/12/09 02:14:21 jtc Exp $ */
3:
4: /*
5: * Copyright (c) 1983, 1993
6: * The Regents of the University of California. All rights reserved.
7: *
8: * Redistribution and use in source and binary forms, with or without
9: * modification, are permitted provided that the following conditions
10: * are met:
11: * 1. Redistributions of source code must retain the above copyright
12: * notice, this list of conditions and the following disclaimer.
13: * 2. Redistributions in binary form must reproduce the above copyright
14: * notice, this list of conditions and the following disclaimer in the
15: * documentation and/or other materials provided with the distribution.
16: * 3. All advertising materials mentioning features or use of this software
17: * must display the following acknowledgement:
18: * This product includes software developed by the University of
19: * California, Berkeley and its contributors.
20: * 4. Neither the name of the University nor the names of its contributors
21: * may be used to endorse or promote products derived from this software
22: * without specific prior written permission.
23: *
24: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34: * SUCH DAMAGE.
35: */
36:
37: #ifndef lint
38: #if 0
39: static char sccsid[] = "@(#)look_up.c 8.1 (Berkeley) 6/6/93";
40: #endif
1.6 ! millert 41: static char rcsid[] = "$OpenBSD: look_up.c,v 1.5 1998/08/18 04:02:18 millert Exp $";
1.1 deraadt 42: #endif /* not lint */
43:
1.4 pjanzen 44: #include "talk.h"
1.1 deraadt 45: #include <errno.h>
1.4 pjanzen 46: #include <unistd.h>
1.1 deraadt 47: #include "talk_ctl.h"
48:
49: /*
50: * See if the local daemon has an invitation for us.
51: */
1.4 pjanzen 52: int
1.1 deraadt 53: check_local()
54: {
55: CTL_RESPONSE response;
56:
57: /* the rest of msg was set up in get_names */
58: #ifdef MSG_EOR
59: /* copy new style sockaddr to old, swap family (short in old) */
60: msg.ctl_addr = *(struct osockaddr *)&ctl_addr;
61: msg.ctl_addr.sa_family = htons(ctl_addr.sin_family);
62: #else
63: msg.ctl_addr = *(struct sockaddr *)&ctl_addr;
64: #endif
65: /* must be initiating a talk */
1.2 mickey 66: if (!look_for_invite(&response))
1.1 deraadt 67: return (0);
68: /*
1.5 millert 69: * There was an invitation waiting for us,
70: * so connect with the other (hopefully waiting) party
1.1 deraadt 71: */
72: current_state = "Waiting to connect with caller";
73: do {
1.2 mickey 74: if (ntohs(response.addr.sa_family) != AF_INET)
1.6 ! millert 75: quit("Response uses invalid network address", 1);
1.1 deraadt 76: errno = 0;
1.2 mickey 77: if (connect(sockt, (struct sockaddr *)&response.addr,
78: sizeof (response.addr)) != -1)
1.1 deraadt 79: return (1);
80: } while (errno == EINTR);
81: if (errno == ECONNREFUSED) {
82: /*
83: * The caller gave up, but his invitation somehow
1.5 millert 84: * was not cleared. Clear it and initiate an
1.1 deraadt 85: * invitation. (We know there are no newer invitations,
86: * the talkd works LIFO.)
87: */
1.2 mickey 88: ctl_transact(his_machine_addr, msg, DELETE, &response);
1.1 deraadt 89: close(sockt);
90: open_sockt();
91: return (0);
92: }
1.6 ! millert 93: quit("Unable to connect with initiator", 1);
1.1 deraadt 94: /*NOTREACHED*/
95: }
96:
97: /*
98: * Look for an invitation on 'machine'
99: */
1.4 pjanzen 100: int
1.1 deraadt 101: look_for_invite(rp)
102: CTL_RESPONSE *rp;
103: {
104: current_state = "Checking for invitation on caller's machine";
105: ctl_transact(his_machine_addr, msg, LOOK_UP, rp);
106: /* the switch is for later options, such as multiple invitations */
107: switch (rp->answer) {
108:
109: case SUCCESS:
110: msg.id_num = htonl(rp->id_num);
111: return (1);
112:
113: default:
114: /* there wasn't an invitation waiting for us */
115: return (0);
116: }
117: }
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