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
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 static char sccsid[] = "@(#)process.c 8.2 (Berkeley) 11/16/93";
38 static const char rcsid[] =
43 * process.c handles the requests, which can be of three types:
44 * ANNOUNCE - announce to a user that a talk is wanted
45 * LEAVE_INVITE - insert the request into the table
46 * LOOK_UP - look up to see if a request is waiting in
47 * in the table for the local user
48 * DELETE - delete invitation
50 #include <sys/param.h>
52 #include <sys/socket.h>
53 #include <netinet/in.h>
54 #include <protocols/talkd.h>
69 process_request(CTL_MSG *mp, CTL_RESPONSE *rp)
74 rp->vers = TALK_VERSION;
76 rp->id_num = htonl(0);
77 if (mp->vers != TALK_VERSION) {
78 syslog(LOG_WARNING, "bad protocol version %d", mp->vers);
79 rp->answer = BADVERSION;
82 mp->id_num = ntohl(mp->id_num);
83 mp->addr.sa_family = ntohs(mp->addr.sa_family);
84 if (mp->addr.sa_family != AF_INET) {
85 syslog(LOG_WARNING, "bad address, family %d",
90 mp->ctl_addr.sa_family = ntohs(mp->ctl_addr.sa_family);
91 if (mp->ctl_addr.sa_family != AF_INET) {
92 syslog(LOG_WARNING, "bad control address, family %d",
93 mp->ctl_addr.sa_family);
94 rp->answer = BADCTLADDR;
97 for (s = mp->l_name; *s; s++)
99 syslog(LOG_NOTICE, "illegal user name. Aborting");
103 mp->pid = ntohl(mp->pid);
105 print_request("process_request", mp);
113 ptr = find_request(mp);
114 if (ptr != (CTL_MSG *)0) {
115 rp->id_num = htonl(ptr->id_num);
116 rp->answer = SUCCESS;
118 insert_table(mp, rp);
122 ptr = find_match(mp);
123 if (ptr != (CTL_MSG *)0) {
124 rp->id_num = htonl(ptr->id_num);
125 rp->addr = ptr->addr;
126 rp->addr.sa_family = htons(ptr->addr.sa_family);
127 rp->answer = SUCCESS;
129 rp->answer = NOT_HERE;
133 rp->answer = delete_invite(mp->id_num);
137 rp->answer = UNKNOWN_REQUEST;
141 print_response("process_request", rp);
145 do_announce(CTL_MSG *mp, CTL_RESPONSE *rp)
151 /* see if the user is logged */
152 result = find_user(mp->r_name, mp->r_tty);
153 if (result != SUCCESS) {
157 #define satosin(sa) ((struct sockaddr_in *)(void *)(sa))
158 hp = gethostbyaddr(&satosin(&mp->ctl_addr)->sin_addr,
159 sizeof (struct in_addr), AF_INET);
160 if (hp == (struct hostent *)0) {
161 rp->answer = MACHINE_UNKNOWN;
164 ptr = find_request(mp);
165 if (ptr == (CTL_MSG *) 0) {
166 insert_table(mp, rp);
167 rp->answer = announce(mp, hp->h_name);
170 if (mp->id_num > ptr->id_num) {
172 * This is an explicit re-announce, so update the id_num
173 * field to avoid duplicates and re-announce the talk.
175 ptr->id_num = new_id();
176 rp->id_num = htonl(ptr->id_num);
177 rp->answer = announce(mp, hp->h_name);
179 /* a duplicated request, so ignore it */
180 rp->id_num = htonl(ptr->id_num);
181 rp->answer = SUCCESS;
186 * Search utmp for the local user
189 find_user(const char *name, char *tty)
195 char ftty[sizeof(_PATH_DEV) - 1 + sizeof(ut->ut_line)];
199 (void) strcpy(ftty, _PATH_DEV);
200 while ((ut = getutxent()) != NULL)
201 if (ut->ut_type == USER_PROCESS &&
202 strcmp(ut->ut_user, name) == 0) {
203 if (*tty == '\0' || best != 0) {
205 status = PERMISSION_DENIED;
206 /* no particular tty was requested */
207 (void) strcpy(ftty + sizeof(_PATH_DEV) - 1,
209 if (stat(ftty, &statb) == 0) {
210 if (!(statb.st_mode & 020))
212 if (statb.st_atime > best) {
213 best = statb.st_atime;
214 (void) strcpy(tty, ut->ut_line);
220 if (strcmp(ut->ut_line, tty) == 0) {