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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>
53 #include "utmpentry.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);
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 utmp for the local user
180 find_user(const char *name, char *tty)
182 struct utmpentry *ep = NULL; /* avoid gcc warnings */
186 char ftty[sizeof(_PATH_DEV) + sizeof(ep->line)];
188 getutentries(NULL, &ep);
190 #define SCMPN(a, b) strncmp(a, b, sizeof (a))
192 (void) strcpy(ftty, _PATH_DEV);
193 for (; ep; ep = ep->next)
194 if (SCMPN(ep->name, name) == 0) {
195 if (*tty == '\0' || best != 0) {
197 status = PERMISSION_DENIED;
198 /* no particular tty was requested */
199 (void) strcpy(ftty + sizeof(_PATH_DEV) - 1,
201 if (stat(ftty, &statb) == 0) {
202 if (!(statb.st_mode & 020))
204 if (statb.st_atime > best) {
205 best = statb.st_atime;
206 (void) strcpy(tty, ep->line);
212 if (strcmp(ep->line, tty) == 0) {