11592Srgrimes/* 21592Srgrimes * Copyright (c) 1983, 1993 31592Srgrimes * The Regents of the University of California. All rights reserved. 41592Srgrimes * 51592Srgrimes * Redistribution and use in source and binary forms, with or without 61592Srgrimes * modification, are permitted provided that the following conditions 71592Srgrimes * are met: 81592Srgrimes * 1. Redistributions of source code must retain the above copyright 91592Srgrimes * notice, this list of conditions and the following disclaimer. 101592Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 111592Srgrimes * notice, this list of conditions and the following disclaimer in the 121592Srgrimes * documentation and/or other materials provided with the distribution. 131592Srgrimes * 3. All advertising materials mentioning features or use of this software 141592Srgrimes * must display the following acknowledgement: 151592Srgrimes * This product includes software developed by the University of 161592Srgrimes * California, Berkeley and its contributors. 171592Srgrimes * 4. Neither the name of the University nor the names of its contributors 181592Srgrimes * may be used to endorse or promote products derived from this software 191592Srgrimes * without specific prior written permission. 201592Srgrimes * 211592Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 221592Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 231592Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 241592Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 251592Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 261592Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 271592Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 281592Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 291592Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 301592Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 311592Srgrimes * SUCH DAMAGE. 321592Srgrimes */ 331592Srgrimes 341592Srgrimes#ifndef lint 3531491Scharnier#if 0 361592Srgrimesstatic char sccsid[] = "@(#)process.c 8.2 (Berkeley) 11/16/93"; 3731491Scharnier#endif 3831491Scharnierstatic const char rcsid[] = 3950476Speter "$FreeBSD$"; 401592Srgrimes#endif /* not lint */ 411592Srgrimes 421592Srgrimes/* 431592Srgrimes * process.c handles the requests, which can be of three types: 441592Srgrimes * ANNOUNCE - announce to a user that a talk is wanted 451592Srgrimes * LEAVE_INVITE - insert the request into the table 461592Srgrimes * LOOK_UP - look up to see if a request is waiting in 471592Srgrimes * in the table for the local user 481592Srgrimes * DELETE - delete invitation 491592Srgrimes */ 501592Srgrimes#include <sys/param.h> 511592Srgrimes#include <sys/stat.h> 521592Srgrimes#include <sys/socket.h> 531592Srgrimes#include <netinet/in.h> 541592Srgrimes#include <protocols/talkd.h> 5531491Scharnier#include <ctype.h> 5631491Scharnier#include <err.h> 571592Srgrimes#include <netdb.h> 5831491Scharnier#include <paths.h> 591592Srgrimes#include <stdio.h> 601592Srgrimes#include <string.h> 6131491Scharnier#include <syslog.h> 62202210Sed#include <utmpx.h> 631592Srgrimes 6490261Simp#include "extern.h" 651592Srgrimes 6631491Scharniervoid 6790261Simpprocess_request(CTL_MSG *mp, CTL_RESPONSE *rp) 681592Srgrimes{ 6990261Simp CTL_MSG *ptr; 703793Sache char *s; 711592Srgrimes 721592Srgrimes rp->vers = TALK_VERSION; 731592Srgrimes rp->type = mp->type; 741592Srgrimes rp->id_num = htonl(0); 751592Srgrimes if (mp->vers != TALK_VERSION) { 7631491Scharnier syslog(LOG_WARNING, "bad protocol version %d", mp->vers); 771592Srgrimes rp->answer = BADVERSION; 781592Srgrimes return; 791592Srgrimes } 801592Srgrimes mp->id_num = ntohl(mp->id_num); 811592Srgrimes mp->addr.sa_family = ntohs(mp->addr.sa_family); 821592Srgrimes if (mp->addr.sa_family != AF_INET) { 8331491Scharnier syslog(LOG_WARNING, "bad address, family %d", 841592Srgrimes mp->addr.sa_family); 851592Srgrimes rp->answer = BADADDR; 861592Srgrimes return; 871592Srgrimes } 881592Srgrimes mp->ctl_addr.sa_family = ntohs(mp->ctl_addr.sa_family); 891592Srgrimes if (mp->ctl_addr.sa_family != AF_INET) { 9031491Scharnier syslog(LOG_WARNING, "bad control address, family %d", 911592Srgrimes mp->ctl_addr.sa_family); 921592Srgrimes rp->answer = BADCTLADDR; 931592Srgrimes return; 941592Srgrimes } 953793Sache for (s = mp->l_name; *s; s++) 963793Sache if (!isprint(*s)) { 9731491Scharnier syslog(LOG_NOTICE, "illegal user name. Aborting"); 983793Sache rp->answer = FAILED; 993793Sache return; 1003793Sache } 1011592Srgrimes mp->pid = ntohl(mp->pid); 1021592Srgrimes if (debug) 1031592Srgrimes print_request("process_request", mp); 1041592Srgrimes switch (mp->type) { 1051592Srgrimes 1061592Srgrimes case ANNOUNCE: 1071592Srgrimes do_announce(mp, rp); 1081592Srgrimes break; 1091592Srgrimes 1101592Srgrimes case LEAVE_INVITE: 1111592Srgrimes ptr = find_request(mp); 1121592Srgrimes if (ptr != (CTL_MSG *)0) { 1131592Srgrimes rp->id_num = htonl(ptr->id_num); 1141592Srgrimes rp->answer = SUCCESS; 1151592Srgrimes } else 1161592Srgrimes insert_table(mp, rp); 1171592Srgrimes break; 1181592Srgrimes 1191592Srgrimes case LOOK_UP: 1201592Srgrimes ptr = find_match(mp); 1211592Srgrimes if (ptr != (CTL_MSG *)0) { 1221592Srgrimes rp->id_num = htonl(ptr->id_num); 1231592Srgrimes rp->addr = ptr->addr; 1241592Srgrimes rp->addr.sa_family = htons(ptr->addr.sa_family); 1251592Srgrimes rp->answer = SUCCESS; 1261592Srgrimes } else 1271592Srgrimes rp->answer = NOT_HERE; 1281592Srgrimes break; 1291592Srgrimes 1301592Srgrimes case DELETE: 1311592Srgrimes rp->answer = delete_invite(mp->id_num); 1321592Srgrimes break; 1331592Srgrimes 1341592Srgrimes default: 1351592Srgrimes rp->answer = UNKNOWN_REQUEST; 1361592Srgrimes break; 1371592Srgrimes } 1381592Srgrimes if (debug) 1391592Srgrimes print_response("process_request", rp); 1401592Srgrimes} 1411592Srgrimes 14231491Scharniervoid 14390261Simpdo_announce(CTL_MSG *mp, CTL_RESPONSE *rp) 1441592Srgrimes{ 1451592Srgrimes struct hostent *hp; 1461592Srgrimes CTL_MSG *ptr; 1471592Srgrimes int result; 1481592Srgrimes 1491592Srgrimes /* see if the user is logged */ 1501592Srgrimes result = find_user(mp->r_name, mp->r_tty); 1511592Srgrimes if (result != SUCCESS) { 1521592Srgrimes rp->answer = result; 1531592Srgrimes return; 1541592Srgrimes } 155201022Sed#define satosin(sa) ((struct sockaddr_in *)(void *)(sa)) 156201022Sed hp = gethostbyaddr(&satosin(&mp->ctl_addr)->sin_addr, 1571592Srgrimes sizeof (struct in_addr), AF_INET); 1581592Srgrimes if (hp == (struct hostent *)0) { 1591592Srgrimes rp->answer = MACHINE_UNKNOWN; 1601592Srgrimes return; 1611592Srgrimes } 1621592Srgrimes ptr = find_request(mp); 1631592Srgrimes if (ptr == (CTL_MSG *) 0) { 1641592Srgrimes insert_table(mp, rp); 1651592Srgrimes rp->answer = announce(mp, hp->h_name); 1661592Srgrimes return; 1671592Srgrimes } 1681592Srgrimes if (mp->id_num > ptr->id_num) { 1691592Srgrimes /* 1701592Srgrimes * This is an explicit re-announce, so update the id_num 1711592Srgrimes * field to avoid duplicates and re-announce the talk. 1721592Srgrimes */ 1731592Srgrimes ptr->id_num = new_id(); 1741592Srgrimes rp->id_num = htonl(ptr->id_num); 1751592Srgrimes rp->answer = announce(mp, hp->h_name); 1761592Srgrimes } else { 1771592Srgrimes /* a duplicated request, so ignore it */ 1781592Srgrimes rp->id_num = htonl(ptr->id_num); 1791592Srgrimes rp->answer = SUCCESS; 1801592Srgrimes } 1811592Srgrimes} 1821592Srgrimes 1831592Srgrimes/* 1841592Srgrimes * Search utmp for the local user 1851592Srgrimes */ 18631491Scharnierint 18790261Simpfind_user(const char *name, char *tty) 1881592Srgrimes{ 189200983Sed struct utmpx *ut; 1901592Srgrimes int status; 1911592Srgrimes struct stat statb; 19214783Sjkh time_t best = 0; 193200983Sed char ftty[sizeof(_PATH_DEV) - 1 + sizeof(ut->ut_line)]; 1941592Srgrimes 195200983Sed setutxent(); 1961592Srgrimes status = NOT_HERE; 1971592Srgrimes (void) strcpy(ftty, _PATH_DEV); 198200983Sed while ((ut = getutxent()) != NULL) 199200983Sed if (ut->ut_type == USER_PROCESS && 200200983Sed strcmp(ut->ut_user, name) == 0) { 20114783Sjkh if (*tty == '\0' || best != 0) { 20214783Sjkh if (best == 0) 20314783Sjkh status = PERMISSION_DENIED; 2041592Srgrimes /* no particular tty was requested */ 2051592Srgrimes (void) strcpy(ftty + sizeof(_PATH_DEV) - 1, 206200983Sed ut->ut_line); 2071592Srgrimes if (stat(ftty, &statb) == 0) { 2081592Srgrimes if (!(statb.st_mode & 020)) 2091592Srgrimes continue; 21014783Sjkh if (statb.st_atime > best) { 21114783Sjkh best = statb.st_atime; 212200983Sed (void) strcpy(tty, ut->ut_line); 21314783Sjkh status = SUCCESS; 21414783Sjkh continue; 21514783Sjkh } 2161592Srgrimes } 2171592Srgrimes } 218200983Sed if (strcmp(ut->ut_line, tty) == 0) { 2191592Srgrimes status = SUCCESS; 2201592Srgrimes break; 2211592Srgrimes } 2221592Srgrimes } 223200983Sed endutxent(); 2241592Srgrimes return (status); 2251592Srgrimes} 226