announce.c revision 21838
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. 3218471Swosch * 3321673Sjkh * $FreeBSD: head/libexec/talkd/announce.c 21838 1997-01-18 08:30:01Z pst $ 341592Srgrimes */ 351592Srgrimes 361592Srgrimes#ifndef lint 3721838Spststatic char sccsid[] = "@(#)announce.c 8.3 (Berkeley) 4/28/95"; 381592Srgrimes#endif /* not lint */ 391592Srgrimes 401592Srgrimes#include <sys/types.h> 411592Srgrimes#include <sys/uio.h> 421592Srgrimes#include <sys/stat.h> 431592Srgrimes#include <sys/time.h> 441592Srgrimes#include <sys/wait.h> 451592Srgrimes#include <sys/socket.h> 4621838Spst 471592Srgrimes#include <protocols/talkd.h> 4821838Spst 491592Srgrimes#include <errno.h> 5021838Spst#include <paths.h> 5121838Spst#include <stdio.h> 5221838Spst#include <stdlib.h> 5321838Spst#include <string.h> 541592Srgrimes#include <syslog.h> 551592Srgrimes#include <unistd.h> 5621838Spst#include <vis.h> 571592Srgrimes 581592Srgrimesextern char hostname[]; 591592Srgrimes 601592Srgrimes/* 611592Srgrimes * Announce an invitation to talk. 621592Srgrimes */ 638870Srgrimes 641592Srgrimes/* 658870Srgrimes * See if the user is accepting messages. If so, announce that 661592Srgrimes * a talk is requested. 671592Srgrimes */ 681592Srgrimesannounce(request, remote_machine) 691592Srgrimes CTL_MSG *request; 701592Srgrimes char *remote_machine; 711592Srgrimes{ 721592Srgrimes char full_tty[32]; 731592Srgrimes FILE *tf; 741592Srgrimes struct stat stbuf; 751592Srgrimes 761592Srgrimes (void)snprintf(full_tty, sizeof(full_tty), 771592Srgrimes "%s%s", _PATH_DEV, request->r_tty); 781592Srgrimes if (stat(full_tty, &stbuf) < 0 || (stbuf.st_mode&020) == 0) 791592Srgrimes return (PERMISSION_DENIED); 801592Srgrimes return (print_mesg(request->r_tty, tf, request, remote_machine)); 811592Srgrimes} 821592Srgrimes 831592Srgrimes#define max(a,b) ( (a) > (b) ? (a) : (b) ) 841592Srgrimes#define N_LINES 5 8521838Spst#define N_CHARS 256 861592Srgrimes 871592Srgrimes/* 888870Srgrimes * Build a block of characters containing the message. 891592Srgrimes * It is sent blank filled and in a single block to 901592Srgrimes * try to keep the message in one piece if the recipient 911592Srgrimes * in in vi at the time 921592Srgrimes */ 931592Srgrimesprint_mesg(tty, tf, request, remote_machine) 941592Srgrimes char *tty; 951592Srgrimes FILE *tf; 961592Srgrimes CTL_MSG *request; 971592Srgrimes char *remote_machine; 981592Srgrimes{ 991592Srgrimes struct timeval clock; 1001592Srgrimes struct timezone zone; 1011592Srgrimes struct tm *localtime(); 1021592Srgrimes struct tm *localclock; 1031592Srgrimes struct iovec iovec; 1041592Srgrimes char line_buf[N_LINES][N_CHARS]; 1051592Srgrimes int sizes[N_LINES]; 1061592Srgrimes char big_buf[N_LINES*N_CHARS]; 10721838Spst char *bptr, *lptr, *vis_user; 1081592Srgrimes int i, j, max_size; 1091592Srgrimes 1101592Srgrimes i = 0; 1111592Srgrimes max_size = 0; 1121592Srgrimes gettimeofday(&clock, &zone); 1131592Srgrimes localclock = localtime( &clock.tv_sec ); 11421838Spst (void)snprintf(line_buf[i], N_CHARS, " "); 1151592Srgrimes sizes[i] = strlen(line_buf[i]); 1161592Srgrimes max_size = max(max_size, sizes[i]); 1171592Srgrimes i++; 11821838Spst (void)snprintf(line_buf[i], N_CHARS, 11921838Spst "Message from Talk_Daemon@%s at %d:%02d ...", 12021838Spst hostname, localclock->tm_hour , localclock->tm_min ); 1211592Srgrimes sizes[i] = strlen(line_buf[i]); 1221592Srgrimes max_size = max(max_size, sizes[i]); 1231592Srgrimes i++; 12421838Spst 12521838Spst vis_user = malloc(strlen(request->l_name) * 4 + 1); 12621838Spst strvis(vis_user, request->l_name, VIS_CSTYLE); 12721838Spst (void)snprintf(line_buf[i], N_CHARS, 12821838Spst "talk: connection requested by %s@%s", vis_user, remote_machine); 1291592Srgrimes sizes[i] = strlen(line_buf[i]); 1301592Srgrimes max_size = max(max_size, sizes[i]); 1311592Srgrimes i++; 13221838Spst (void)snprintf(line_buf[i], N_CHARS, "talk: respond with: talk %s@%s", 13321838Spst vis_user, remote_machine); 1341592Srgrimes sizes[i] = strlen(line_buf[i]); 1351592Srgrimes max_size = max(max_size, sizes[i]); 1361592Srgrimes i++; 13721838Spst (void)snprintf(line_buf[i], N_CHARS, " "); 1381592Srgrimes sizes[i] = strlen(line_buf[i]); 1391592Srgrimes max_size = max(max_size, sizes[i]); 1401592Srgrimes i++; 1411592Srgrimes bptr = big_buf; 1421801Sphk *bptr++ = '\007'; /* send something to wake them up */ 1431592Srgrimes *bptr++ = '\r'; /* add a \r in case of raw mode */ 1441592Srgrimes *bptr++ = '\n'; 1451592Srgrimes for (i = 0; i < N_LINES; i++) { 1461592Srgrimes /* copy the line into the big buffer */ 1471592Srgrimes lptr = line_buf[i]; 1481592Srgrimes while (*lptr != '\0') 1491592Srgrimes *(bptr++) = *(lptr++); 1501592Srgrimes /* pad out the rest of the lines with blanks */ 1511592Srgrimes for (j = sizes[i]; j < max_size + 2; j++) 1521592Srgrimes *(bptr++) = ' '; 1531592Srgrimes *(bptr++) = '\r'; /* add a \r in case of raw mode */ 1541592Srgrimes *(bptr++) = '\n'; 1551592Srgrimes } 1561592Srgrimes *bptr = '\0'; 1571592Srgrimes iovec.iov_base = big_buf; 1581592Srgrimes iovec.iov_len = bptr - big_buf; 1591592Srgrimes /* 1601592Srgrimes * we choose a timeout of RING_WAIT-5 seconds so that we don't 1611592Srgrimes * stack up processes trying to write messages to a tty 1621592Srgrimes * that is permanently blocked. 1631592Srgrimes */ 1641592Srgrimes if (ttymsg(&iovec, 1, tty, RING_WAIT - 5) != NULL) 1651592Srgrimes return (FAILED); 1661592Srgrimes 1671592Srgrimes return (SUCCESS); 1681592Srgrimes} 169