2 * Copyright (c) 1983, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
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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
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30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * @(#)process.c 8.2 (Berkeley) 11/16/93
34 * $FreeBSD: src/libexec/talkd/process.c,v 1.9 1999/08/28 00:10:16 peter Exp $
38 * process.c handles the requests, which can be of three types:
39 * ANNOUNCE - announce to a user that a talk is wanted
40 * LEAVE_INVITE - insert the request into the table
41 * LOOK_UP - look up to see if a request is waiting in
42 * in the table for the local user
43 * DELETE - delete invitation
45 #include <sys/param.h>
47 #include <sys/socket.h>
48 #include <netinet/in.h>
49 #include <protocols/talkd.h>
57 #include "utmpentry.h"
64 process_request(CTL_MSG
*mp
, CTL_RESPONSE
*rp
)
69 rp
->vers
= TALK_VERSION
;
71 rp
->id_num
= htonl(0);
72 if (mp
->vers
!= TALK_VERSION
) {
73 syslog(LOG_WARNING
, "bad protocol version %d", mp
->vers
);
74 rp
->answer
= BADVERSION
;
77 mp
->id_num
= ntohl(mp
->id_num
);
78 mp
->addr
.sa_family
= ntohs(mp
->addr
.sa_family
);
79 if (mp
->addr
.sa_family
!= AF_INET
) {
80 syslog(LOG_WARNING
, "bad address, family %d",
85 mp
->ctl_addr
.sa_family
= ntohs(mp
->ctl_addr
.sa_family
);
86 if (mp
->ctl_addr
.sa_family
!= AF_INET
) {
87 syslog(LOG_WARNING
, "bad control address, family %d",
88 mp
->ctl_addr
.sa_family
);
89 rp
->answer
= BADCTLADDR
;
92 for (s
= mp
->l_name
; *s
; s
++)
94 syslog(LOG_NOTICE
, "illegal user name. Aborting");
98 mp
->pid
= ntohl(mp
->pid
);
100 print_request("process_request", mp
);
108 ptr
= find_request(mp
);
110 rp
->id_num
= htonl(ptr
->id_num
);
111 rp
->answer
= SUCCESS
;
113 insert_table(mp
, rp
);
117 ptr
= find_match(mp
);
119 rp
->id_num
= htonl(ptr
->id_num
);
120 rp
->addr
= ptr
->addr
;
121 rp
->addr
.sa_family
= htons(ptr
->addr
.sa_family
);
122 rp
->answer
= SUCCESS
;
124 rp
->answer
= NOT_HERE
;
128 rp
->answer
= delete_invite(mp
->id_num
);
132 rp
->answer
= UNKNOWN_REQUEST
;
136 print_response("process_request", rp
);
140 do_announce(CTL_MSG
*mp
, CTL_RESPONSE
*rp
)
146 /* see if the user is logged */
147 result
= find_user(mp
->r_name
, mp
->r_tty
);
148 if (result
!= SUCCESS
) {
152 #define satosin(sa) ((struct sockaddr_in *)(void *)(sa))
153 hp
= gethostbyaddr(&satosin(&mp
->ctl_addr
)->sin_addr
,
154 sizeof (struct in_addr
), AF_INET
);
156 rp
->answer
= MACHINE_UNKNOWN
;
159 ptr
= find_request(mp
);
161 insert_table(mp
, rp
);
162 rp
->answer
= announce(mp
, hp
->h_name
);
165 if (mp
->id_num
> ptr
->id_num
) {
167 * This is an explicit re-announce, so update the id_num
168 * field to avoid duplicates and re-announce the talk.
170 ptr
->id_num
= new_id();
171 rp
->id_num
= htonl(ptr
->id_num
);
172 rp
->answer
= announce(mp
, hp
->h_name
);
174 /* a duplicated request, so ignore it */
175 rp
->id_num
= htonl(ptr
->id_num
);
176 rp
->answer
= SUCCESS
;
181 * Search utmp for the local user
184 find_user(const char *name
, char *tty
)
186 struct utmpentry
*ep
;
190 char ftty
[sizeof(_PATH_DEV
) + sizeof(ep
->line
)];
192 getutentries(NULL
, &ep
);
194 #define SCMPN(a, b) strncmp(a, b, sizeof (a))
196 (void) strcpy(ftty
, _PATH_DEV
);
197 for (; ep
; ep
= ep
->next
)
198 if (SCMPN(ep
->name
, name
) == 0) {
199 if (*tty
== '\0' || best
!= 0) {
201 status
= PERMISSION_DENIED
;
202 /* no particular tty was requested */
203 (void) strcpy(ftty
+ sizeof(_PATH_DEV
) - 1,
205 if (stat(ftty
, &statb
) == 0) {
206 if (!(statb
.st_mode
& 020))
208 if (statb
.st_atime
> best
) {
209 best
= statb
.st_atime
;
210 (void) strcpy(tty
, ep
->line
);
216 if (strcmp(ep
->line
, tty
) == 0) {