168349Sobrien/* $NetBSD: announce.c,v 1.24 2009/03/16 01:04:32 lukem Exp $ */ 2290152Sdelphij 368349Sobrien/* 468349Sobrien * Copyright (c) 1983, 1993 568349Sobrien * The Regents of the University of California. All rights reserved. 668349Sobrien * 768349Sobrien * Redistribution and use in source and binary forms, with or without 868349Sobrien * modification, are permitted provided that the following conditions 968349Sobrien * are met: 1068349Sobrien * 1. Redistributions of source code must retain the above copyright 1168349Sobrien * notice, this list of conditions and the following disclaimer. 1268349Sobrien * 2. Redistributions in binary form must reproduce the above copyright 13186690Sobrien * notice, this list of conditions and the following disclaimer in the 14191736Sobrien * documentation and/or other materials provided with the distribution. 1568349Sobrien * 3. Neither the name of the University nor the names of its contributors 1668349Sobrien * may be used to endorse or promote products derived from this software 1768349Sobrien * without specific prior written permission. 1868349Sobrien * 19103373Sobrien * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20103373Sobrien * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21103373Sobrien * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22226048Sobrien * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 2368349Sobrien * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24186690Sobrien * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25267843Sdelphij * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26103373Sobrien * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27103373Sobrien * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28103373Sobrien * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29159764Sobrien * SUCH DAMAGE. 30103373Sobrien */ 31103373Sobrien 32103373Sobrien#include <sys/cdefs.h> 33159764Sobrien#ifndef lint 34267843Sdelphij#if 0 35267843Sdelphijstatic char sccsid[] = "@(#)announce.c 8.3 (Berkeley) 4/28/95"; 36267843Sdelphij#else 37267843Sdelphij__RCSID("$NetBSD: announce.c,v 1.24 2009/03/16 01:04:32 lukem Exp $"); 38159764Sobrien#endif 39103373Sobrien#endif /* not lint */ 40103373Sobrien 41103373Sobrien#include <sys/types.h> 42159764Sobrien#include <sys/uio.h> 43103373Sobrien#include <sys/stat.h> 44159764Sobrien#include <sys/time.h> 45103373Sobrien#include <sys/wait.h> 46159764Sobrien#include <sys/socket.h> 47159764Sobrien#include <protocols/talkd.h> 48159764Sobrien#include <errno.h> 49159764Sobrien#include <syslog.h> 50159764Sobrien#include <unistd.h> 51159764Sobrien#include <stdio.h> 5268349Sobrien#include <stdlib.h> 5368349Sobrien#include <string.h> 5468349Sobrien#include <time.h> 55186690Sobrien#include <vis.h> 5668349Sobrien#include <paths.h> 5768349Sobrien#include <util.h> 5868349Sobrien#include "extern.h" 59133359Sobrien 60133359Sobrienextern char hostname[]; 61186690Sobrien 6268349Sobrien/* 6368349Sobrien * Announce an invitation to talk. 6468349Sobrien */ 6568349Sobrien 6668349Sobrien/* 67186690Sobrien * See if the user is accepting messages. If so, announce that 6868349Sobrien * a talk is requested. 6968349Sobrien */ 7068349Sobrienint 71186690Sobrienannounce(CTL_MSG *request, const char *remote_machine) 7268349Sobrien{ 73186690Sobrien char full_tty[32]; 7468349Sobrien struct stat stbuf; 7568349Sobrien 7668349Sobrien (void)snprintf(full_tty, sizeof(full_tty), 77186690Sobrien "%s%s", _PATH_DEV, request->r_tty); 7868349Sobrien if (stat(full_tty, &stbuf) < 0 || (stbuf.st_mode&S_IWGRP) == 0) 7968349Sobrien return (PERMISSION_DENIED); 80191736Sobrien return (print_mesg(request->r_tty, request, remote_machine)); 81191736Sobrien} 82191736Sobrien 83191736Sobrien#define max(a, b) ((a) > (b) ? (a) : (b)) 84191736Sobrien#define N_LINES 5 8568349Sobrien#define N_CHARS 256 8668349Sobrien 8768349Sobrien/* 8868349Sobrien * Build a block of characters containing the message. 8968349Sobrien * It is sent blank filled and in a single block to 9068349Sobrien * try to keep the message in one piece if the recipient 9168349Sobrien * is in vi at the time. 9268349Sobrien */ 9368349Sobrienint 9468349Sobrienprint_mesg(const char *tty, CTL_MSG *request, const char *remote_machine) 9568349Sobrien{ 9668349Sobrien struct timeval clocktv; 9768349Sobrien time_t clocktime; 9868349Sobrien struct tm *localclock; 9968349Sobrien struct iovec iovec; 10068349Sobrien char line_buf[N_LINES][N_CHARS]; 10168349Sobrien int sizes[N_LINES]; 10268349Sobrien char big_buf[(N_LINES + 1) * N_CHARS]; 10368349Sobrien char *bptr, *lptr, vis_user[sizeof(request->l_name) * 4]; 10468349Sobrien int i, j, max_size; 10568349Sobrien 10668349Sobrien i = 0; 10768349Sobrien max_size = 0; 10868349Sobrien (void)gettimeofday(&clocktv, NULL); 10968349Sobrien clocktime = clocktv.tv_sec; 11068349Sobrien localclock = localtime(&clocktime); 11168349Sobrien (void)snprintf(line_buf[i], N_CHARS, " "); 11268349Sobrien sizes[i] = strlen(line_buf[i]); 11368349Sobrien max_size = max(max_size, sizes[i]); 11468349Sobrien i++; 11568349Sobrien 11668349Sobrien (void)snprintf(line_buf[i], N_CHARS, 11768349Sobrien "Message from Talk_Daemon@%s at %d:%02d ...", 11868349Sobrien hostname, localclock->tm_hour, localclock->tm_min); 119186690Sobrien sizes[i] = strlen(line_buf[i]); 120186690Sobrien max_size = max(max_size, sizes[i]); 121186690Sobrien i++; 122186690Sobrien if (strlen(request->l_name) + 1 > sizeof(vis_user) / 4) 123186690Sobrien return (FAILED); 124186690Sobrien strvis(vis_user, request->l_name, VIS_CSTYLE); 125186690Sobrien (void)snprintf(line_buf[i], N_CHARS, 126186690Sobrien "talk: connection requested by %s@%s.", vis_user, remote_machine); 127186690Sobrien sizes[i] = strlen(line_buf[i]); 128186690Sobrien max_size = max(max_size, sizes[i]); 129186690Sobrien i++; 13068349Sobrien (void)snprintf(line_buf[i], N_CHARS, 13168349Sobrien "talk: respond with: talk %s@%s", vis_user, remote_machine); 13268349Sobrien sizes[i] = strlen(line_buf[i]); 13368349Sobrien max_size = max(max_size, sizes[i]); 13468349Sobrien i++; 13568349Sobrien (void)snprintf(line_buf[i], N_CHARS, " "); 13668349Sobrien sizes[i] = strlen(line_buf[i]); 13768349Sobrien max_size = max(max_size, sizes[i]); 13868349Sobrien i++; 13968349Sobrien bptr = big_buf; 14068349Sobrien *bptr++ = '\a'; /* send something to wake them up */ 14168349Sobrien *bptr++ = '\r'; /* add a \r in case of raw mode */ 14268349Sobrien *bptr++ = '\n'; 14368349Sobrien for (i = 0; i < N_LINES; i++) { 14468349Sobrien /* copy the line into the big buffer */ 14568349Sobrien lptr = line_buf[i]; 14668349Sobrien while (*lptr != '\0' && lptr < (line_buf[i] + N_CHARS)) 14768349Sobrien *(bptr++) = *(lptr++); 14868349Sobrien /* pad out the rest of the lines with blanks */ 14968349Sobrien for (j = sizes[i]; j < max_size + 2; j++) 15068349Sobrien *(bptr++) = ' '; 15168349Sobrien *(bptr++) = '\r'; /* add a \r in case of raw mode */ 15268349Sobrien *(bptr++) = '\n'; 15368349Sobrien } 15468349Sobrien *bptr = '\0'; 15568349Sobrien iovec.iov_base = big_buf; 15668349Sobrien iovec.iov_len = bptr - big_buf; 15768349Sobrien /* 15868349Sobrien * we choose a timeout of RING_WAIT-5 seconds so that we don't 15968349Sobrien * stack up processes trying to write messages to a tty 16068349Sobrien * that is permanently blocked. 16168349Sobrien */ 16268349Sobrien if (ttymsg(&iovec, 1, tty, RING_WAIT - 5) != NULL) 16368349Sobrien return (FAILED); 16468349Sobrien 16568349Sobrien return (SUCCESS); 16668349Sobrien} 16768349Sobrien