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.
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11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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29 * @(#)process.c 8.2 (Berkeley) 11/16/93
30 * $FreeBSD: src/libexec/talkd/process.c,v 1.9 1999/08/28 00:10:16 peter Exp $
34 * process.c handles the requests, which can be of three types:
35 * ANNOUNCE - announce to a user that a talk is wanted
36 * LEAVE_INVITE - insert the request into the table
37 * LOOK_UP - look up to see if a request is waiting in
38 * in the table for the local user
39 * DELETE - delete invitation
41 #include <sys/param.h>
43 #include <sys/socket.h>
44 #include <netinet/in.h>
45 #include <protocols/talkd.h>
60 process_request(CTL_MSG
*mp
, CTL_RESPONSE
*rp
)
65 rp
->vers
= TALK_VERSION
;
67 rp
->id_num
= htonl(0);
68 if (mp
->vers
!= TALK_VERSION
) {
69 syslog(LOG_WARNING
, "bad protocol version %d", mp
->vers
);
70 rp
->answer
= BADVERSION
;
73 mp
->id_num
= ntohl(mp
->id_num
);
74 mp
->addr
.sa_family
= ntohs(mp
->addr
.sa_family
);
75 if (mp
->addr
.sa_family
!= AF_INET
) {
76 syslog(LOG_WARNING
, "bad address, family %d",
81 mp
->ctl_addr
.sa_family
= ntohs(mp
->ctl_addr
.sa_family
);
82 if (mp
->ctl_addr
.sa_family
!= AF_INET
) {
83 syslog(LOG_WARNING
, "bad control address, family %d",
84 mp
->ctl_addr
.sa_family
);
85 rp
->answer
= BADCTLADDR
;
88 for (s
= mp
->l_name
; *s
; s
++)
90 syslog(LOG_NOTICE
, "illegal user name. Aborting");
94 mp
->pid
= ntohl(mp
->pid
);
96 print_request("process_request", mp
);
104 ptr
= find_request(mp
);
106 rp
->id_num
= htonl(ptr
->id_num
);
107 rp
->answer
= SUCCESS
;
109 insert_table(mp
, rp
);
113 ptr
= find_match(mp
);
115 rp
->id_num
= htonl(ptr
->id_num
);
116 rp
->addr
= ptr
->addr
;
117 rp
->addr
.sa_family
= htons(ptr
->addr
.sa_family
);
118 rp
->answer
= SUCCESS
;
120 rp
->answer
= NOT_HERE
;
124 rp
->answer
= delete_invite(mp
->id_num
);
128 rp
->answer
= UNKNOWN_REQUEST
;
132 print_response("process_request", rp
);
136 do_announce(CTL_MSG
*mp
, CTL_RESPONSE
*rp
)
142 /* see if the user is logged */
143 result
= find_user(mp
->r_name
, mp
->r_tty
, sizeof(mp
->r_tty
));
144 if (result
!= SUCCESS
) {
148 #define satosin(sa) ((struct sockaddr_in *)(void *)(sa))
149 hp
= gethostbyaddr(&satosin(&mp
->ctl_addr
)->sin_addr
,
150 sizeof (struct in_addr
), AF_INET
);
152 rp
->answer
= MACHINE_UNKNOWN
;
155 ptr
= find_request(mp
);
157 insert_table(mp
, rp
);
158 rp
->answer
= announce(mp
, hp
->h_name
);
161 if (mp
->id_num
> ptr
->id_num
) {
163 * This is an explicit re-announce, so update the id_num
164 * field to avoid duplicates and re-announce the talk.
166 ptr
->id_num
= new_id();
167 rp
->id_num
= htonl(ptr
->id_num
);
168 rp
->answer
= announce(mp
, hp
->h_name
);
170 /* a duplicated request, so ignore it */
171 rp
->id_num
= htonl(ptr
->id_num
);
172 rp
->answer
= SUCCESS
;
177 * Search utmpx for the local user
180 find_user(const char *name
, char *tty
, size_t ttylen
)
182 struct utmpx
*ut
; /* avoid gcc warnings */
186 char ftty
[sizeof(_PATH_DEV
) + _UTX_LINESIZE
];
188 if (ttylen
> sizeof(ftty
))
189 ttylen
= sizeof(ftty
);
193 strlcpy(ftty
, _PATH_DEV
, sizeof(ftty
));
195 while ((ut
= getutxent()) != NULL
) {
196 if (ut
->ut_type
!= USER_PROCESS
)
198 if (strncmp(ut
->ut_name
, name
, sizeof(ut
->ut_name
)) != 0)
200 if (*tty
== '\0' || best
!= 0) {
202 status
= PERMISSION_DENIED
;
203 /* no particular tty was requested */
204 strlcat(ftty
, ut
->ut_line
, sizeof(ftty
));
205 if (stat(ftty
, &statb
) == 0) {
206 if (!(statb
.st_mode
& 020))
208 if (statb
.st_atime
> best
) {
209 best
= statb
.st_atime
;
210 strlcpy(tty
, ut
->ut_line
, ttylen
);
216 if (strcmp(ut
->ut_line
, tty
) == 0) {