1 /* $NetBSD: announce.c,v 1.20 2003/04/22 03:51:07 itojun Exp $ */ 2 3 /* 4 * Copyright (c) 1983, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 #ifndef lint 38 #if 0 39 static char sccsid[] = "@(#)announce.c 8.3 (Berkeley) 4/28/95"; 40 #else 41 __RCSID("$NetBSD: announce.c,v 1.20 2003/04/22 03:51:07 itojun Exp $"); 42 #endif 43 #endif /* not lint */ 44 45 #include <sys/types.h> 46 #include <sys/uio.h> 47 #include <sys/stat.h> 48 #include <sys/time.h> 49 #include <sys/wait.h> 50 #include <sys/socket.h> 51 #include <protocols/talkd.h> 52 #include <errno.h> 53 #include <syslog.h> 54 #include <unistd.h> 55 #include <stdio.h> 56 #include <stdlib.h> 57 #include <string.h> 58 #include <time.h> 59 #include <vis.h> 60 #include <paths.h> 61 #include <util.h> 62 #include "extern.h" 63 64 extern char hostname[]; 65 66 /* 67 * Announce an invitation to talk. 68 */ 69 70 /* 71 * See if the user is accepting messages. If so, announce that 72 * a talk is requested. 73 */ 74 int 75 announce(request, remote_machine) 76 CTL_MSG *request; 77 char *remote_machine; 78 { 79 char full_tty[32]; 80 struct stat stbuf; 81 82 (void)snprintf(full_tty, sizeof(full_tty), 83 "%s%s", _PATH_DEV, request->r_tty); 84 if (stat(full_tty, &stbuf) < 0 || (stbuf.st_mode&S_IWGRP) == 0) 85 return (PERMISSION_DENIED); 86 return (print_mesg(request->r_tty, request, remote_machine)); 87 } 88 89 #define max(a, b) ((a) > (b) ? (a) : (b)) 90 #define N_LINES 5 91 #define N_CHARS 256 92 93 /* 94 * Build a block of characters containing the message. 95 * It is sent blank filled and in a single block to 96 * try to keep the message in one piece if the recipient 97 * in in vi at the time 98 */ 99 int 100 print_mesg(tty, request, remote_machine) 101 char *tty; 102 CTL_MSG *request; 103 char *remote_machine; 104 { 105 struct timeval clock; 106 time_t clocktime; 107 struct timezone zone; 108 struct tm *localclock; 109 struct iovec iovec; 110 char line_buf[N_LINES][N_CHARS]; 111 int sizes[N_LINES]; 112 char big_buf[(N_LINES + 1) * N_CHARS]; 113 char *bptr, *lptr, vis_user[sizeof(request->l_name) * 4]; 114 int i, j, max_size; 115 116 i = 0; 117 max_size = 0; 118 (void)gettimeofday(&clock, &zone); 119 clocktime = clock.tv_sec; 120 localclock = localtime(&clocktime); 121 (void)snprintf(line_buf[i], N_CHARS, " "); 122 sizes[i] = strlen(line_buf[i]); 123 max_size = max(max_size, sizes[i]); 124 i++; 125 126 (void)snprintf(line_buf[i], N_CHARS, 127 "Message from Talk_Daemon@%s at %d:%02d ...", 128 hostname, localclock->tm_hour, localclock->tm_min); 129 sizes[i] = strlen(line_buf[i]); 130 max_size = max(max_size, sizes[i]); 131 i++; 132 if (strlen(request->l_name) + 1 > sizeof(vis_user) / 4) 133 return (FAILED); 134 strvis(vis_user, request->l_name, VIS_CSTYLE); 135 (void)snprintf(line_buf[i], N_CHARS, 136 "talk: connection requested by %s@%s.", vis_user, remote_machine); 137 sizes[i] = strlen(line_buf[i]); 138 max_size = max(max_size, sizes[i]); 139 i++; 140 (void)snprintf(line_buf[i], N_CHARS, 141 "talk: respond with: talk %s@%s", vis_user, remote_machine); 142 sizes[i] = strlen(line_buf[i]); 143 max_size = max(max_size, sizes[i]); 144 i++; 145 (void)snprintf(line_buf[i], N_CHARS, " "); 146 sizes[i] = strlen(line_buf[i]); 147 max_size = max(max_size, sizes[i]); 148 i++; 149 bptr = big_buf; 150 *bptr++ = '\a'; /* send something to wake them up */ 151 *bptr++ = '\r'; /* add a \r in case of raw mode */ 152 *bptr++ = '\n'; 153 for (i = 0; i < N_LINES; i++) { 154 /* copy the line into the big buffer */ 155 lptr = line_buf[i]; 156 while (*lptr != '\0' && lptr < (line_buf[i] + N_CHARS)) 157 *(bptr++) = *(lptr++); 158 /* pad out the rest of the lines with blanks */ 159 for (j = sizes[i]; j < max_size + 2; j++) 160 *(bptr++) = ' '; 161 *(bptr++) = '\r'; /* add a \r in case of raw mode */ 162 *(bptr++) = '\n'; 163 } 164 *bptr = '\0'; 165 iovec.iov_base = big_buf; 166 iovec.iov_len = bptr - big_buf; 167 /* 168 * we choose a timeout of RING_WAIT-5 seconds so that we don't 169 * stack up processes trying to write messages to a tty 170 * that is permanently blocked. 171 */ 172 if (ttymsg(&iovec, 1, tty, RING_WAIT - 5) != NULL) 173 return (FAILED); 174 175 return (SUCCESS); 176 } 177