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>
68 process_request(CTL_MSG *mp, CTL_RESPONSE *rp)
73 rp->vers = TALK_VERSION;
75 rp->id_num = htonl(0);
76 if (mp->vers != TALK_VERSION) {
77 syslog(LOG_WARNING, "bad protocol version %d", mp->vers);
78 rp->answer = BADVERSION;
81 mp->id_num = ntohl(mp->id_num);
82 mp->addr.sa_family = ntohs(mp->addr.sa_family);
83 if (mp->addr.sa_family != AF_INET) {
84 syslog(LOG_WARNING, "bad address, family %d",
89 mp->ctl_addr.sa_family = ntohs(mp->ctl_addr.sa_family);
90 if (mp->ctl_addr.sa_family != AF_INET) {
91 syslog(LOG_WARNING, "bad control address, family %d",
92 mp->ctl_addr.sa_family);
93 rp->answer = BADCTLADDR;
96 for (s = mp->l_name; *s; s++)
98 syslog(LOG_NOTICE, "illegal user name. Aborting");
102 mp->pid = ntohl(mp->pid);
104 print_request("process_request", mp);
112 ptr = find_request(mp);
113 if (ptr != (CTL_MSG *)0) {
114 rp->id_num = htonl(ptr->id_num);
115 rp->answer = SUCCESS;
117 insert_table(mp, rp);
121 ptr = find_match(mp);
122 if (ptr != (CTL_MSG *)0) {
123 rp->id_num = htonl(ptr->id_num);
124 rp->addr = ptr->addr;
125 rp->addr.sa_family = htons(ptr->addr.sa_family);
126 rp->answer = SUCCESS;
128 rp->answer = NOT_HERE;
132 rp->answer = delete_invite(mp->id_num);
136 rp->answer = UNKNOWN_REQUEST;
140 print_response("process_request", rp);
144 do_announce(CTL_MSG *mp, CTL_RESPONSE *rp)
150 /* see if the user is logged */
151 result = find_user(mp->r_name, mp->r_tty);
152 if (result != SUCCESS) {
156 #define satosin(sa) ((struct sockaddr_in *)(sa))
157 hp = gethostbyaddr((char *)&satosin(&mp->ctl_addr)->sin_addr,
158 sizeof (struct in_addr), AF_INET);
159 if (hp == (struct hostent *)0) {
160 rp->answer = MACHINE_UNKNOWN;
163 ptr = find_request(mp);
164 if (ptr == (CTL_MSG *) 0) {
165 insert_table(mp, rp);
166 rp->answer = announce(mp, hp->h_name);
169 if (mp->id_num > ptr->id_num) {
171 * This is an explicit re-announce, so update the id_num
172 * field to avoid duplicates and re-announce the talk.
174 ptr->id_num = new_id();
175 rp->id_num = htonl(ptr->id_num);
176 rp->answer = announce(mp, hp->h_name);
178 /* a duplicated request, so ignore it */
179 rp->id_num = htonl(ptr->id_num);
180 rp->answer = SUCCESS;
187 * Search utmp for the local user
190 find_user(const char *name, char *tty)
197 char line[sizeof(ubuf.ut_line) + 1];
198 char ftty[sizeof(_PATH_DEV) - 1 + sizeof(line)];
200 if ((fd = fopen(_PATH_UTMP, "r")) == NULL) {
201 warnx("can't read %s", _PATH_UTMP);
204 #define SCMPN(a, b) strncmp(a, b, sizeof (a))
206 (void) strcpy(ftty, _PATH_DEV);
207 while (fread((char *) &ubuf, sizeof ubuf, 1, fd) == 1)
208 if (SCMPN(ubuf.ut_name, name) == 0) {
209 strncpy(line, ubuf.ut_line, sizeof(ubuf.ut_line));
210 line[sizeof(ubuf.ut_line)] = '\0';
211 if (*tty == '\0' || best != 0) {
213 status = PERMISSION_DENIED;
214 /* no particular tty was requested */
215 (void) strcpy(ftty + sizeof(_PATH_DEV) - 1,
217 if (stat(ftty, &statb) == 0) {
218 if (!(statb.st_mode & 020))
220 if (statb.st_atime > best) {
221 best = statb.st_atime;
222 (void) strcpy(tty, line);
228 if (strcmp(line, tty) == 0) {