1 /* $NetBSD: announce.c,v 1.8 1997/06/29 19:13:02 christos 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 1.8 1997/06/29 19:13:02 christos 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 <vis.h> 59 #include <paths.h> 60 #include <util.h> 61 #include "extern.h" 62 63 extern char hostname[]; 64 65 /* 66 * Announce an invitation to talk. 67 */ 68 69 /* 70 * See if the user is accepting messages. If so, announce that 71 * a talk is requested. 72 */ 73 int 74 announce(request, remote_machine) 75 CTL_MSG *request; 76 char *remote_machine; 77 { 78 char full_tty[32]; 79 struct stat stbuf; 80 81 (void)snprintf(full_tty, sizeof(full_tty), 82 "%s%s", _PATH_DEV, request->r_tty); 83 if (stat(full_tty, &stbuf) < 0 || (stbuf.st_mode&020) == 0) 84 return (PERMISSION_DENIED); 85 return (print_mesg(request->r_tty, request, remote_machine)); 86 } 87 88 #define max(a,b) ( (a) > (b) ? (a) : (b) ) 89 #define N_LINES 5 90 #define N_CHARS 256 91 92 /* 93 * Build a block of characters containing the message. 94 * It is sent blank filled and in a single block to 95 * try to keep the message in one piece if the recipient 96 * in in vi at the time 97 */ 98 int 99 print_mesg(tty, request, remote_machine) 100 char *tty; 101 CTL_MSG *request; 102 char *remote_machine; 103 { 104 struct timeval clock; 105 time_t clocktime; 106 struct timezone zone; 107 struct tm *localclock; 108 struct iovec iovec; 109 char line_buf[N_LINES][N_CHARS]; 110 int sizes[N_LINES]; 111 char big_buf[N_LINES*N_CHARS]; 112 char *bptr, *lptr, *vis_user; 113 int i, j, max_size; 114 115 i = 0; 116 max_size = 0; 117 gettimeofday(&clock, &zone); 118 clocktime = clock.tv_sec; 119 localclock = localtime(&clocktime); 120 (void)snprintf(line_buf[i], N_CHARS, " "); 121 sizes[i] = strlen(line_buf[i]); 122 max_size = max(max_size, sizes[i]); 123 i++; 124 (void)snprintf(line_buf[i], N_CHARS, 125 "Message from Talk_Daemon@%s at %d:%02d ...", 126 hostname, localclock->tm_hour , localclock->tm_min ); 127 sizes[i] = strlen(line_buf[i]); 128 max_size = max(max_size, sizes[i]); 129 i++; 130 vis_user = (char *) malloc(strlen(request->l_name) * 4 + 1); 131 strvis(vis_user, request->l_name, VIS_CSTYLE); 132 (void)snprintf(line_buf[i], N_CHARS, 133 "talk: connection requested by %s@%s.", vis_user, remote_machine); 134 sizes[i] = strlen(line_buf[i]); 135 max_size = max(max_size, sizes[i]); 136 i++; 137 (void)snprintf(line_buf[i], N_CHARS, 138 "talk: respond with: talk %s@%s", vis_user, remote_machine); 139 sizes[i] = strlen(line_buf[i]); 140 max_size = max(max_size, sizes[i]); 141 i++; 142 (void)snprintf(line_buf[i], N_CHARS, " "); 143 sizes[i] = strlen(line_buf[i]); 144 max_size = max(max_size, sizes[i]); 145 i++; 146 bptr = big_buf; 147 *bptr++ = ''; /* send something to wake them up */ 148 *bptr++ = '\r'; /* add a \r in case of raw mode */ 149 *bptr++ = '\n'; 150 for (i = 0; i < N_LINES; i++) { 151 /* copy the line into the big buffer */ 152 lptr = line_buf[i]; 153 while (*lptr != '\0') 154 *(bptr++) = *(lptr++); 155 /* pad out the rest of the lines with blanks */ 156 for (j = sizes[i]; j < max_size + 2; j++) 157 *(bptr++) = ' '; 158 *(bptr++) = '\r'; /* add a \r in case of raw mode */ 159 *(bptr++) = '\n'; 160 } 161 *bptr = '\0'; 162 iovec.iov_base = big_buf; 163 iovec.iov_len = bptr - big_buf; 164 /* 165 * we choose a timeout of RING_WAIT-5 seconds so that we don't 166 * stack up processes trying to write messages to a tty 167 * that is permanently blocked. 168 */ 169 if (ttymsg(&iovec, 1, tty, RING_WAIT - 5) != NULL) 170 return (FAILED); 171 172 return (SUCCESS); 173 } 174