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>
66 process_request(CTL_MSG *mp, CTL_RESPONSE *rp)
72 rp->vers = TALK_VERSION;
74 rp->id_num = htonl(0);
75 if (mp->vers != TALK_VERSION) {
76 syslog(LOG_WARNING, "bad protocol version %d", mp->vers);
77 rp->answer = BADVERSION;
80 mp->id_num = ntohl(mp->id_num);
81 mp->addr.sa_family = ntohs(mp->addr.sa_family);
82 if (mp->addr.sa_family != AF_INET) {
83 syslog(LOG_WARNING, "bad address, family %d",
88 mp->ctl_addr.sa_family = ntohs(mp->ctl_addr.sa_family);
89 if (mp->ctl_addr.sa_family != AF_INET) {
90 syslog(LOG_WARNING, "bad control address, family %d",
91 mp->ctl_addr.sa_family);
92 rp->answer = BADCTLADDR;
95 for (s = mp->l_name; *s; s++)
97 syslog(LOG_NOTICE, "illegal user name. Aborting");
101 mp->pid = ntohl(mp->pid);
103 print_request("process_request", mp);
111 ptr = find_request(mp);
112 if (ptr != (CTL_MSG *)0) {
113 rp->id_num = htonl(ptr->id_num);
114 rp->answer = SUCCESS;
116 insert_table(mp, rp);
120 ptr = find_match(mp);
121 if (ptr != (CTL_MSG *)0) {
122 rp->id_num = htonl(ptr->id_num);
123 rp->addr = ptr->addr;
124 rp->addr.sa_family = htons(ptr->addr.sa_family);
125 rp->answer = SUCCESS;
127 rp->answer = NOT_HERE;
131 rp->answer = delete_invite(mp->id_num);
135 rp->answer = UNKNOWN_REQUEST;
139 print_response("process_request", rp);
143 do_announce(CTL_MSG *mp, CTL_RESPONSE *rp)
149 /* see if the user is logged */
150 result = find_user(mp->r_name, mp->r_tty);
151 if (result != SUCCESS) {
155 #define satosin(sa) ((struct sockaddr_in *)(sa))
156 hp = gethostbyaddr((char *)&satosin(&mp->ctl_addr)->sin_addr,
157 sizeof (struct in_addr), AF_INET);
158 if (hp == (struct hostent *)0) {
159 rp->answer = MACHINE_UNKNOWN;
162 ptr = find_request(mp);
163 if (ptr == (CTL_MSG *) 0) {
164 insert_table(mp, rp);
165 rp->answer = announce(mp, hp->h_name);
168 if (mp->id_num > ptr->id_num) {
170 * This is an explicit re-announce, so update the id_num
171 * field to avoid duplicates and re-announce the talk.
173 ptr->id_num = new_id();
174 rp->id_num = htonl(ptr->id_num);
175 rp->answer = announce(mp, hp->h_name);
177 /* a duplicated request, so ignore it */
178 rp->id_num = htonl(ptr->id_num);
179 rp->answer = SUCCESS;
186 * Search utmp for the local user
189 find_user(const char *name, char *tty)
196 char line[sizeof(ubuf.ut_line) + 1];
197 char ftty[sizeof(_PATH_DEV) - 1 + sizeof(line)];
199 if ((fd = fopen(_PATH_UTMP, "r")) == NULL) {
200 warnx("can't read %s", _PATH_UTMP);
203 #define SCMPN(a, b) strncmp(a, b, sizeof (a))
205 (void) strcpy(ftty, _PATH_DEV);
206 while (fread((char *) &ubuf, sizeof ubuf, 1, fd) == 1)
207 if (SCMPN(ubuf.ut_name, name) == 0) {
208 strncpy(line, ubuf.ut_line, sizeof(ubuf.ut_line));
209 line[sizeof(ubuf.ut_line)] = '\0';
210 if (*tty == '\0' || best != 0) {
212 status = PERMISSION_DENIED;
213 /* no particular tty was requested */
214 (void) strcpy(ftty + sizeof(_PATH_DEV) - 1,
216 if (stat(ftty, &statb) == 0) {
217 if (!(statb.st_mode & 020))
219 if (statb.st_atime > best) {
220 best = statb.st_atime;
221 (void) strcpy(tty, line);
227 if (strcmp(line, tty) == 0) {