233 lines
6.3 KiB
C
233 lines
6.3 KiB
C
/*
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* Copyright (c) 1983, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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static char sccsid[] = "@(#)process.c 8.2 (Berkeley) 11/16/93";
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#endif /* not lint */
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/*
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* process.c handles the requests, which can be of three types:
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* ANNOUNCE - announce to a user that a talk is wanted
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* LEAVE_INVITE - insert the request into the table
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* LOOK_UP - look up to see if a request is waiting in
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* in the table for the local user
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* DELETE - delete invitation
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*/
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#include <sys/param.h>
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#include <sys/stat.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <protocols/talkd.h>
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#include <netdb.h>
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#include <syslog.h>
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#include <stdio.h>
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#include <string.h>
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#include <ctype.h>
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#include <paths.h>
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CTL_MSG *find_request();
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CTL_MSG *find_match();
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process_request(mp, rp)
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register CTL_MSG *mp;
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register CTL_RESPONSE *rp;
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{
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register CTL_MSG *ptr;
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extern int debug;
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char *s;
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rp->vers = TALK_VERSION;
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rp->type = mp->type;
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rp->id_num = htonl(0);
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if (mp->vers != TALK_VERSION) {
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syslog(LOG_WARNING, "Bad protocol version %d", mp->vers);
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rp->answer = BADVERSION;
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return;
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}
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mp->id_num = ntohl(mp->id_num);
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mp->addr.sa_family = ntohs(mp->addr.sa_family);
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if (mp->addr.sa_family != AF_INET) {
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syslog(LOG_WARNING, "Bad address, family %d",
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mp->addr.sa_family);
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rp->answer = BADADDR;
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return;
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}
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mp->ctl_addr.sa_family = ntohs(mp->ctl_addr.sa_family);
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if (mp->ctl_addr.sa_family != AF_INET) {
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syslog(LOG_WARNING, "Bad control address, family %d",
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mp->ctl_addr.sa_family);
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rp->answer = BADCTLADDR;
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return;
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}
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for (s = mp->l_name; *s; s++)
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if (!isprint(*s)) {
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syslog(LOG_NOTICE, "Illegal user name. Aborting");
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rp->answer = FAILED;
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return;
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}
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mp->pid = ntohl(mp->pid);
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if (debug)
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print_request("process_request", mp);
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switch (mp->type) {
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case ANNOUNCE:
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do_announce(mp, rp);
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break;
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case LEAVE_INVITE:
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ptr = find_request(mp);
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if (ptr != (CTL_MSG *)0) {
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rp->id_num = htonl(ptr->id_num);
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rp->answer = SUCCESS;
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} else
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insert_table(mp, rp);
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break;
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case LOOK_UP:
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ptr = find_match(mp);
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if (ptr != (CTL_MSG *)0) {
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rp->id_num = htonl(ptr->id_num);
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rp->addr = ptr->addr;
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rp->addr.sa_family = htons(ptr->addr.sa_family);
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rp->answer = SUCCESS;
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} else
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rp->answer = NOT_HERE;
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break;
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case DELETE:
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rp->answer = delete_invite(mp->id_num);
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break;
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default:
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rp->answer = UNKNOWN_REQUEST;
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break;
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}
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if (debug)
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print_response("process_request", rp);
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}
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do_announce(mp, rp)
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register CTL_MSG *mp;
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CTL_RESPONSE *rp;
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{
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struct hostent *hp;
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CTL_MSG *ptr;
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int result;
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/* see if the user is logged */
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result = find_user(mp->r_name, mp->r_tty);
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if (result != SUCCESS) {
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rp->answer = result;
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return;
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}
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#define satosin(sa) ((struct sockaddr_in *)(sa))
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hp = gethostbyaddr((char *)&satosin(&mp->ctl_addr)->sin_addr,
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sizeof (struct in_addr), AF_INET);
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if (hp == (struct hostent *)0) {
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rp->answer = MACHINE_UNKNOWN;
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return;
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}
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ptr = find_request(mp);
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if (ptr == (CTL_MSG *) 0) {
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insert_table(mp, rp);
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rp->answer = announce(mp, hp->h_name);
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return;
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}
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if (mp->id_num > ptr->id_num) {
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/*
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* This is an explicit re-announce, so update the id_num
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* field to avoid duplicates and re-announce the talk.
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*/
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ptr->id_num = new_id();
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rp->id_num = htonl(ptr->id_num);
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rp->answer = announce(mp, hp->h_name);
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} else {
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/* a duplicated request, so ignore it */
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rp->id_num = htonl(ptr->id_num);
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rp->answer = SUCCESS;
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}
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}
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#include <utmp.h>
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/*
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* Search utmp for the local user
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*/
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find_user(name, tty)
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char *name, *tty;
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{
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struct utmp ubuf;
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int status;
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FILE *fd;
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struct stat statb;
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time_t best = 0;
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char line[sizeof(ubuf.ut_line) + 1];
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char ftty[sizeof(_PATH_DEV) - 1 + sizeof(line)];
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if ((fd = fopen(_PATH_UTMP, "r")) == NULL) {
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fprintf(stderr, "talkd: can't read %s.\n", _PATH_UTMP);
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return (FAILED);
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}
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#define SCMPN(a, b) strncmp(a, b, sizeof (a))
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status = NOT_HERE;
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(void) strcpy(ftty, _PATH_DEV);
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while (fread((char *) &ubuf, sizeof ubuf, 1, fd) == 1)
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if (SCMPN(ubuf.ut_name, name) == 0) {
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strncpy(line, ubuf.ut_line, sizeof(ubuf.ut_line));
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line[sizeof(ubuf.ut_line)] = '\0';
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if (*tty == '\0' || best != 0) {
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if (best == 0)
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status = PERMISSION_DENIED;
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/* no particular tty was requested */
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(void) strcpy(ftty + sizeof(_PATH_DEV) - 1,
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line);
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if (stat(ftty, &statb) == 0) {
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if (!(statb.st_mode & 020))
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continue;
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if (statb.st_atime > best) {
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best = statb.st_atime;
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(void) strcpy(tty, line);
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status = SUCCESS;
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continue;
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}
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}
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}
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if (strcmp(line, tty) == 0) {
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status = SUCCESS;
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break;
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}
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}
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fclose(fd);
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return (status);
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}
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