announce.c revision 1592
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 351592Srgrimesstatic char sccsid[] = "@(#)announce.c 8.2 (Berkeley) 1/7/94"; 361592Srgrimes#endif /* not lint */ 371592Srgrimes 381592Srgrimes#include <sys/types.h> 391592Srgrimes#include <sys/uio.h> 401592Srgrimes#include <sys/stat.h> 411592Srgrimes#include <sys/time.h> 421592Srgrimes#include <sys/wait.h> 431592Srgrimes#include <sys/socket.h> 441592Srgrimes#include <protocols/talkd.h> 451592Srgrimes#include <sgtty.h> 461592Srgrimes#include <errno.h> 471592Srgrimes#include <syslog.h> 481592Srgrimes#include <unistd.h> 491592Srgrimes#include <stdio.h> 501592Srgrimes#include <string.h> 511592Srgrimes#include <paths.h> 521592Srgrimes 531592Srgrimesextern char hostname[]; 541592Srgrimes 551592Srgrimes/* 561592Srgrimes * Announce an invitation to talk. 571592Srgrimes */ 581592Srgrimes 591592Srgrimes/* 601592Srgrimes * See if the user is accepting messages. If so, announce that 611592Srgrimes * a talk is requested. 621592Srgrimes */ 631592Srgrimesannounce(request, remote_machine) 641592Srgrimes CTL_MSG *request; 651592Srgrimes char *remote_machine; 661592Srgrimes{ 671592Srgrimes char full_tty[32]; 681592Srgrimes FILE *tf; 691592Srgrimes struct stat stbuf; 701592Srgrimes 711592Srgrimes (void)snprintf(full_tty, sizeof(full_tty), 721592Srgrimes "%s%s", _PATH_DEV, request->r_tty); 731592Srgrimes if (stat(full_tty, &stbuf) < 0 || (stbuf.st_mode&020) == 0) 741592Srgrimes return (PERMISSION_DENIED); 751592Srgrimes return (print_mesg(request->r_tty, tf, request, remote_machine)); 761592Srgrimes} 771592Srgrimes 781592Srgrimes#define max(a,b) ( (a) > (b) ? (a) : (b) ) 791592Srgrimes#define N_LINES 5 801592Srgrimes#define N_CHARS 120 811592Srgrimes 821592Srgrimes/* 831592Srgrimes * Build a block of characters containing the message. 841592Srgrimes * It is sent blank filled and in a single block to 851592Srgrimes * try to keep the message in one piece if the recipient 861592Srgrimes * in in vi at the time 871592Srgrimes */ 881592Srgrimesprint_mesg(tty, tf, request, remote_machine) 891592Srgrimes char *tty; 901592Srgrimes FILE *tf; 911592Srgrimes CTL_MSG *request; 921592Srgrimes char *remote_machine; 931592Srgrimes{ 941592Srgrimes struct timeval clock; 951592Srgrimes struct timezone zone; 961592Srgrimes struct tm *localtime(); 971592Srgrimes struct tm *localclock; 981592Srgrimes struct iovec iovec; 991592Srgrimes char line_buf[N_LINES][N_CHARS]; 1001592Srgrimes int sizes[N_LINES]; 1011592Srgrimes char big_buf[N_LINES*N_CHARS]; 1021592Srgrimes char *bptr, *lptr, *ttymsg(); 1031592Srgrimes int i, j, max_size; 1041592Srgrimes 1051592Srgrimes i = 0; 1061592Srgrimes max_size = 0; 1071592Srgrimes gettimeofday(&clock, &zone); 1081592Srgrimes localclock = localtime( &clock.tv_sec ); 1091592Srgrimes (void)sprintf(line_buf[i], " "); 1101592Srgrimes sizes[i] = strlen(line_buf[i]); 1111592Srgrimes max_size = max(max_size, sizes[i]); 1121592Srgrimes i++; 1131592Srgrimes (void)sprintf(line_buf[i], "Message from Talk_Daemon@%s at %d:%02d ...", 1141592Srgrimes hostname, localclock->tm_hour , localclock->tm_min ); 1151592Srgrimes sizes[i] = strlen(line_buf[i]); 1161592Srgrimes max_size = max(max_size, sizes[i]); 1171592Srgrimes i++; 1181592Srgrimes (void)sprintf(line_buf[i], "talk: connection requested by %s@%s", 1191592Srgrimes request->l_name, remote_machine); 1201592Srgrimes sizes[i] = strlen(line_buf[i]); 1211592Srgrimes max_size = max(max_size, sizes[i]); 1221592Srgrimes i++; 1231592Srgrimes (void)sprintf(line_buf[i], "talk: respond with: talk %s@%s", 1241592Srgrimes request->l_name, remote_machine); 1251592Srgrimes sizes[i] = strlen(line_buf[i]); 1261592Srgrimes max_size = max(max_size, sizes[i]); 1271592Srgrimes i++; 1281592Srgrimes (void)sprintf(line_buf[i], " "); 1291592Srgrimes sizes[i] = strlen(line_buf[i]); 1301592Srgrimes max_size = max(max_size, sizes[i]); 1311592Srgrimes i++; 1321592Srgrimes bptr = big_buf; 1331592Srgrimes *bptr++ = ''; /* send something to wake them up */ 1341592Srgrimes *bptr++ = '\r'; /* add a \r in case of raw mode */ 1351592Srgrimes *bptr++ = '\n'; 1361592Srgrimes for (i = 0; i < N_LINES; i++) { 1371592Srgrimes /* copy the line into the big buffer */ 1381592Srgrimes lptr = line_buf[i]; 1391592Srgrimes while (*lptr != '\0') 1401592Srgrimes *(bptr++) = *(lptr++); 1411592Srgrimes /* pad out the rest of the lines with blanks */ 1421592Srgrimes for (j = sizes[i]; j < max_size + 2; j++) 1431592Srgrimes *(bptr++) = ' '; 1441592Srgrimes *(bptr++) = '\r'; /* add a \r in case of raw mode */ 1451592Srgrimes *(bptr++) = '\n'; 1461592Srgrimes } 1471592Srgrimes *bptr = '\0'; 1481592Srgrimes iovec.iov_base = big_buf; 1491592Srgrimes iovec.iov_len = bptr - big_buf; 1501592Srgrimes /* 1511592Srgrimes * we choose a timeout of RING_WAIT-5 seconds so that we don't 1521592Srgrimes * stack up processes trying to write messages to a tty 1531592Srgrimes * that is permanently blocked. 1541592Srgrimes */ 1551592Srgrimes if (ttymsg(&iovec, 1, tty, RING_WAIT - 5) != NULL) 1561592Srgrimes return (FAILED); 1571592Srgrimes 1581592Srgrimes return (SUCCESS); 1591592Srgrimes} 160