2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 1983, 1993
5 * The Regents of the University of California. All rights reserved.
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8 * modification, are permitted provided that the following conditions
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34 static char sccsid[] = "@(#)process.c 8.2 (Berkeley) 11/16/93";
36 static const char rcsid[] =
41 * process.c handles the requests, which can be of three types:
42 * ANNOUNCE - announce to a user that a talk is wanted
43 * LEAVE_INVITE - insert the request into the table
44 * LOOK_UP - look up to see if a request is waiting in
45 * in the table for the local user
46 * DELETE - delete invitation
48 #include <sys/param.h>
50 #include <sys/socket.h>
51 #include <netinet/in.h>
52 #include <protocols/talkd.h>
65 process_request(CTL_MSG *mp, CTL_RESPONSE *rp)
70 rp->vers = TALK_VERSION;
72 rp->id_num = htonl(0);
73 if (mp->vers != TALK_VERSION) {
74 syslog(LOG_WARNING, "bad protocol version %d", mp->vers);
75 rp->answer = BADVERSION;
78 mp->id_num = ntohl(mp->id_num);
79 mp->addr.sa_family = ntohs(mp->addr.sa_family);
80 if (mp->addr.sa_family != AF_INET) {
81 syslog(LOG_WARNING, "bad address, family %d",
86 mp->ctl_addr.sa_family = ntohs(mp->ctl_addr.sa_family);
87 if (mp->ctl_addr.sa_family != AF_INET) {
88 syslog(LOG_WARNING, "bad control address, family %d",
89 mp->ctl_addr.sa_family);
90 rp->answer = BADCTLADDR;
93 for (s = mp->l_name; *s; s++)
95 syslog(LOG_NOTICE, "illegal user name. Aborting");
99 mp->pid = ntohl(mp->pid);
101 print_request("process_request", mp);
109 ptr = find_request(mp);
110 if (ptr != (CTL_MSG *)0) {
111 rp->id_num = htonl(ptr->id_num);
112 rp->answer = SUCCESS;
114 insert_table(mp, rp);
118 ptr = find_match(mp);
119 if (ptr != (CTL_MSG *)0) {
120 rp->id_num = htonl(ptr->id_num);
121 rp->addr = ptr->addr;
122 rp->addr.sa_family = htons(ptr->addr.sa_family);
123 rp->answer = SUCCESS;
125 rp->answer = NOT_HERE;
129 rp->answer = delete_invite(mp->id_num);
133 rp->answer = UNKNOWN_REQUEST;
137 print_response("process_request", rp);
141 do_announce(CTL_MSG *mp, CTL_RESPONSE *rp)
147 /* see if the user is logged */
148 result = find_user(mp->r_name, mp->r_tty);
149 if (result != SUCCESS) {
153 #define satosin(sa) ((struct sockaddr_in *)(void *)(sa))
154 hp = gethostbyaddr(&satosin(&mp->ctl_addr)->sin_addr,
155 sizeof (struct in_addr), AF_INET);
156 if (hp == (struct hostent *)0) {
157 rp->answer = MACHINE_UNKNOWN;
160 ptr = find_request(mp);
161 if (ptr == (CTL_MSG *) 0) {
162 insert_table(mp, rp);
163 rp->answer = announce(mp, hp->h_name);
166 if (mp->id_num > ptr->id_num) {
168 * This is an explicit re-announce, so update the id_num
169 * field to avoid duplicates and re-announce the talk.
171 ptr->id_num = new_id();
172 rp->id_num = htonl(ptr->id_num);
173 rp->answer = announce(mp, hp->h_name);
175 /* a duplicated request, so ignore it */
176 rp->id_num = htonl(ptr->id_num);
177 rp->answer = SUCCESS;
182 * Search utmp for the local user
185 find_user(const char *name, char *tty)
191 char ftty[sizeof(_PATH_DEV) - 1 + sizeof(ut->ut_line)];
195 (void) strcpy(ftty, _PATH_DEV);
196 while ((ut = getutxent()) != NULL)
197 if (ut->ut_type == USER_PROCESS &&
198 strcmp(ut->ut_user, 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, ut->ut_line);
216 if (strcmp(ut->ut_line, tty) == 0) {