1*0Sstevel@tonic-gate /* 2*0Sstevel@tonic-gate * CDDL HEADER START 3*0Sstevel@tonic-gate * 4*0Sstevel@tonic-gate * The contents of this file are subject to the terms of the 5*0Sstevel@tonic-gate * Common Development and Distribution License, Version 1.0 only 6*0Sstevel@tonic-gate * (the "License"). You may not use this file except in compliance 7*0Sstevel@tonic-gate * with the License. 8*0Sstevel@tonic-gate * 9*0Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10*0Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing. 11*0Sstevel@tonic-gate * See the License for the specific language governing permissions 12*0Sstevel@tonic-gate * and limitations under the License. 13*0Sstevel@tonic-gate * 14*0Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each 15*0Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16*0Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the 17*0Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying 18*0Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner] 19*0Sstevel@tonic-gate * 20*0Sstevel@tonic-gate * CDDL HEADER END 21*0Sstevel@tonic-gate * 22*0Sstevel@tonic-gate * Copyright 2002 Sun Microsystems, Inc. All rights reserved. 23*0Sstevel@tonic-gate * Use is subject to license terms. 24*0Sstevel@tonic-gate */ 25*0Sstevel@tonic-gate 26*0Sstevel@tonic-gate /* 27*0Sstevel@tonic-gate * Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T 28*0Sstevel@tonic-gate * All Rights Reserved. 29*0Sstevel@tonic-gate */ 30*0Sstevel@tonic-gate 31*0Sstevel@tonic-gate /* 32*0Sstevel@tonic-gate * University Copyright- Copyright (c) 1982, 1986, 1988 33*0Sstevel@tonic-gate * The Regents of the University of California. 34*0Sstevel@tonic-gate * All Rights Reserved. 35*0Sstevel@tonic-gate * 36*0Sstevel@tonic-gate * University Acknowledgment- Portions of this document are derived from 37*0Sstevel@tonic-gate * software developed by the University of California, Berkeley, and its 38*0Sstevel@tonic-gate * contributors. 39*0Sstevel@tonic-gate */ 40*0Sstevel@tonic-gate 41*0Sstevel@tonic-gate #pragma ident "%Z%%M% %I% %E% SMI" 42*0Sstevel@tonic-gate 43*0Sstevel@tonic-gate 44*0Sstevel@tonic-gate /* 45*0Sstevel@tonic-gate * process.c handles the requests, which can be of three types: 46*0Sstevel@tonic-gate * 47*0Sstevel@tonic-gate * ANNOUNCE - announce to a user that a talk is wanted 48*0Sstevel@tonic-gate * 49*0Sstevel@tonic-gate * LEAVE_INVITE - insert the request into the table 50*0Sstevel@tonic-gate * 51*0Sstevel@tonic-gate * LOOK_UP - look up to see if a request is waiting in 52*0Sstevel@tonic-gate * in the table for the local user 53*0Sstevel@tonic-gate * 54*0Sstevel@tonic-gate * DELETE - delete invitation 55*0Sstevel@tonic-gate * 56*0Sstevel@tonic-gate */ 57*0Sstevel@tonic-gate 58*0Sstevel@tonic-gate #include <sys/types.h> 59*0Sstevel@tonic-gate #include <sys/stat.h> 60*0Sstevel@tonic-gate #include <fcntl.h> 61*0Sstevel@tonic-gate #include <syslog.h> 62*0Sstevel@tonic-gate #include <string.h> 63*0Sstevel@tonic-gate #include <utmpx.h> 64*0Sstevel@tonic-gate #include <unistd.h> 65*0Sstevel@tonic-gate #include <stdlib.h> 66*0Sstevel@tonic-gate #include <stdio.h> 67*0Sstevel@tonic-gate #include "talkd_impl.h" 68*0Sstevel@tonic-gate 69*0Sstevel@tonic-gate static void do_announce(CTL_MSG *request, CTL_RESPONSE *response); 70*0Sstevel@tonic-gate static int find_user(char *name, char *tty); 71*0Sstevel@tonic-gate 72*0Sstevel@tonic-gate void 73*0Sstevel@tonic-gate process_request(CTL_MSG *request, CTL_RESPONSE *response) 74*0Sstevel@tonic-gate { 75*0Sstevel@tonic-gate CTL_MSG *ptr; 76*0Sstevel@tonic-gate 77*0Sstevel@tonic-gate response->type = request->type; 78*0Sstevel@tonic-gate response->id_num = 0; 79*0Sstevel@tonic-gate 80*0Sstevel@tonic-gate /* 81*0Sstevel@tonic-gate * Check if any of the strings within the request structure aren't 82*0Sstevel@tonic-gate * NUL terminated, and if so don't bother processing the request 83*0Sstevel@tonic-gate * further. 84*0Sstevel@tonic-gate */ 85*0Sstevel@tonic-gate if ((memchr(request->l_name, '\0', sizeof (request->l_name)) == NULL) || 86*0Sstevel@tonic-gate (memchr(request->r_name, '\0', sizeof (request->r_name)) == NULL) || 87*0Sstevel@tonic-gate (memchr(request->r_tty, '\0', sizeof (request->r_tty)) == NULL)) { 88*0Sstevel@tonic-gate response->answer = FAILED; 89*0Sstevel@tonic-gate openlog("talk", 0, LOG_AUTH); 90*0Sstevel@tonic-gate syslog(LOG_CRIT, "malformed talk request\n"); 91*0Sstevel@tonic-gate closelog(); 92*0Sstevel@tonic-gate return; 93*0Sstevel@tonic-gate } 94*0Sstevel@tonic-gate 95*0Sstevel@tonic-gate switch (request->type) { 96*0Sstevel@tonic-gate 97*0Sstevel@tonic-gate case ANNOUNCE : 98*0Sstevel@tonic-gate 99*0Sstevel@tonic-gate do_announce(request, response); 100*0Sstevel@tonic-gate break; 101*0Sstevel@tonic-gate 102*0Sstevel@tonic-gate case LEAVE_INVITE : 103*0Sstevel@tonic-gate 104*0Sstevel@tonic-gate ptr = find_request(request); 105*0Sstevel@tonic-gate if (ptr != NULL) { 106*0Sstevel@tonic-gate response->id_num = ptr->id_num; 107*0Sstevel@tonic-gate response->answer = SUCCESS; 108*0Sstevel@tonic-gate } else { 109*0Sstevel@tonic-gate insert_table(request, response); 110*0Sstevel@tonic-gate } 111*0Sstevel@tonic-gate break; 112*0Sstevel@tonic-gate 113*0Sstevel@tonic-gate case LOOK_UP : 114*0Sstevel@tonic-gate 115*0Sstevel@tonic-gate ptr = find_match(request); 116*0Sstevel@tonic-gate if (ptr != NULL) { 117*0Sstevel@tonic-gate response->id_num = ptr->id_num; 118*0Sstevel@tonic-gate response->addr = ptr->addr; 119*0Sstevel@tonic-gate response->answer = SUCCESS; 120*0Sstevel@tonic-gate } else { 121*0Sstevel@tonic-gate response->answer = NOT_HERE; 122*0Sstevel@tonic-gate } 123*0Sstevel@tonic-gate break; 124*0Sstevel@tonic-gate 125*0Sstevel@tonic-gate case DELETE : 126*0Sstevel@tonic-gate 127*0Sstevel@tonic-gate response->answer = delete_invite(request->id_num); 128*0Sstevel@tonic-gate break; 129*0Sstevel@tonic-gate 130*0Sstevel@tonic-gate default : 131*0Sstevel@tonic-gate 132*0Sstevel@tonic-gate response->answer = UNKNOWN_REQUEST; 133*0Sstevel@tonic-gate break; 134*0Sstevel@tonic-gate } 135*0Sstevel@tonic-gate } 136*0Sstevel@tonic-gate 137*0Sstevel@tonic-gate static void 138*0Sstevel@tonic-gate do_announce(CTL_MSG *request, CTL_RESPONSE *response) 139*0Sstevel@tonic-gate { 140*0Sstevel@tonic-gate struct hostent *hp; 141*0Sstevel@tonic-gate CTL_MSG *ptr; 142*0Sstevel@tonic-gate int result; 143*0Sstevel@tonic-gate 144*0Sstevel@tonic-gate /* 145*0Sstevel@tonic-gate * See if the user is logged. 146*0Sstevel@tonic-gate */ 147*0Sstevel@tonic-gate result = find_user(request->r_name, request->r_tty); 148*0Sstevel@tonic-gate if (result != SUCCESS) { 149*0Sstevel@tonic-gate response->answer = result; 150*0Sstevel@tonic-gate return; 151*0Sstevel@tonic-gate } 152*0Sstevel@tonic-gate 153*0Sstevel@tonic-gate hp = gethostbyaddr((const char *)&request->ctl_addr.sin_addr, 154*0Sstevel@tonic-gate sizeof (struct in_addr), AF_INET); 155*0Sstevel@tonic-gate if (hp == NULL) { 156*0Sstevel@tonic-gate response->answer = MACHINE_UNKNOWN; 157*0Sstevel@tonic-gate return; 158*0Sstevel@tonic-gate } 159*0Sstevel@tonic-gate 160*0Sstevel@tonic-gate ptr = find_request(request); 161*0Sstevel@tonic-gate if (ptr == NULL) { 162*0Sstevel@tonic-gate insert_table(request, response); 163*0Sstevel@tonic-gate response->answer = announce(request, hp->h_name); 164*0Sstevel@tonic-gate } else if (request->id_num > ptr->id_num) { 165*0Sstevel@tonic-gate /* 166*0Sstevel@tonic-gate * This is an explicit re-announce, so update the id_num 167*0Sstevel@tonic-gate * field to avoid duplicates and re-announce the talk. 168*0Sstevel@tonic-gate */ 169*0Sstevel@tonic-gate ptr->id_num = response->id_num = new_id(); 170*0Sstevel@tonic-gate response->answer = announce(request, hp->h_name); 171*0Sstevel@tonic-gate } else { 172*0Sstevel@tonic-gate /* a duplicated request, so ignore it */ 173*0Sstevel@tonic-gate response->id_num = ptr->id_num; 174*0Sstevel@tonic-gate response->answer = SUCCESS; 175*0Sstevel@tonic-gate } 176*0Sstevel@tonic-gate } 177*0Sstevel@tonic-gate 178*0Sstevel@tonic-gate /* 179*0Sstevel@tonic-gate * Search utmp for the local user. 180*0Sstevel@tonic-gate */ 181*0Sstevel@tonic-gate 182*0Sstevel@tonic-gate static int 183*0Sstevel@tonic-gate find_user(char *name, char *tty) 184*0Sstevel@tonic-gate { 185*0Sstevel@tonic-gate struct utmpx *ubuf; 186*0Sstevel@tonic-gate int tfd; 187*0Sstevel@tonic-gate char dev[MAXPATHLEN]; 188*0Sstevel@tonic-gate 189*0Sstevel@tonic-gate setutxent(); /* reset the utmpx file */ 190*0Sstevel@tonic-gate 191*0Sstevel@tonic-gate while (ubuf = getutxent()) { 192*0Sstevel@tonic-gate if (ubuf->ut_type == USER_PROCESS && 193*0Sstevel@tonic-gate strncmp(ubuf->ut_user, name, sizeof (ubuf->ut_user)) == 0) { 194*0Sstevel@tonic-gate /* 195*0Sstevel@tonic-gate * Check if this entry is really a tty. 196*0Sstevel@tonic-gate */ 197*0Sstevel@tonic-gate (void) snprintf(dev, sizeof (dev), "/dev/%.*s", 198*0Sstevel@tonic-gate sizeof (ubuf->ut_line), ubuf->ut_line); 199*0Sstevel@tonic-gate if ((tfd = open(dev, O_WRONLY|O_NOCTTY)) == -1) { 200*0Sstevel@tonic-gate continue; 201*0Sstevel@tonic-gate } 202*0Sstevel@tonic-gate if (!isatty(tfd)) { 203*0Sstevel@tonic-gate (void) close(tfd); 204*0Sstevel@tonic-gate openlog("talk", 0, LOG_AUTH); 205*0Sstevel@tonic-gate syslog(LOG_CRIT, "%.*s in utmp is not a tty\n", 206*0Sstevel@tonic-gate sizeof (ubuf->ut_line), ubuf->ut_line); 207*0Sstevel@tonic-gate closelog(); 208*0Sstevel@tonic-gate continue; 209*0Sstevel@tonic-gate } 210*0Sstevel@tonic-gate (void) close(tfd); 211*0Sstevel@tonic-gate if (*tty == '\0') { 212*0Sstevel@tonic-gate /* 213*0Sstevel@tonic-gate * No particular tty was requested. 214*0Sstevel@tonic-gate */ 215*0Sstevel@tonic-gate (void) strlcpy(tty, ubuf->ut_line, TTY_SIZE); 216*0Sstevel@tonic-gate endutxent(); /* close the utmpx file */ 217*0Sstevel@tonic-gate return (SUCCESS); 218*0Sstevel@tonic-gate } else if (strcmp(ubuf->ut_line, tty) == 0) { 219*0Sstevel@tonic-gate endutxent(); /* close the utmpx file */ 220*0Sstevel@tonic-gate return (SUCCESS); 221*0Sstevel@tonic-gate } 222*0Sstevel@tonic-gate } 223*0Sstevel@tonic-gate } 224*0Sstevel@tonic-gate 225*0Sstevel@tonic-gate endutxent(); /* close the utmpx file */ 226*0Sstevel@tonic-gate return (NOT_HERE); 227*0Sstevel@tonic-gate } 228