1 /* 2 * Copyright (c) 1983, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * $FreeBSD$ 34 */ 35 36 #ifndef lint 37 static char sccsid[] = "@(#)announce.c 8.2 (Berkeley) 1/7/94"; 38 #endif /* not lint */ 39 40 #include <sys/types.h> 41 #include <sys/uio.h> 42 #include <sys/stat.h> 43 #include <sys/time.h> 44 #include <sys/wait.h> 45 #include <sys/socket.h> 46 #include <protocols/talkd.h> 47 #include <errno.h> 48 #include <syslog.h> 49 #include <unistd.h> 50 #include <stdio.h> 51 #include <string.h> 52 #include <paths.h> 53 54 extern char hostname[]; 55 56 /* 57 * Announce an invitation to talk. 58 */ 59 60 /* 61 * See if the user is accepting messages. If so, announce that 62 * a talk is requested. 63 */ 64 announce(request, remote_machine) 65 CTL_MSG *request; 66 char *remote_machine; 67 { 68 char full_tty[32]; 69 FILE *tf; 70 struct stat stbuf; 71 72 (void)snprintf(full_tty, sizeof(full_tty), 73 "%s%s", _PATH_DEV, request->r_tty); 74 if (stat(full_tty, &stbuf) < 0 || (stbuf.st_mode&020) == 0) 75 return (PERMISSION_DENIED); 76 return (print_mesg(request->r_tty, tf, request, remote_machine)); 77 } 78 79 #define max(a,b) ( (a) > (b) ? (a) : (b) ) 80 #define N_LINES 5 81 #define N_CHARS 120 82 83 /* 84 * Build a block of characters containing the message. 85 * It is sent blank filled and in a single block to 86 * try to keep the message in one piece if the recipient 87 * in in vi at the time 88 */ 89 print_mesg(tty, tf, request, remote_machine) 90 char *tty; 91 FILE *tf; 92 CTL_MSG *request; 93 char *remote_machine; 94 { 95 struct timeval clock; 96 struct timezone zone; 97 struct tm *localtime(); 98 struct tm *localclock; 99 struct iovec iovec; 100 char line_buf[N_LINES][N_CHARS]; 101 int sizes[N_LINES]; 102 char big_buf[N_LINES*N_CHARS]; 103 char *bptr, *lptr, *ttymsg(); 104 int i, j, max_size; 105 106 i = 0; 107 max_size = 0; 108 gettimeofday(&clock, &zone); 109 localclock = localtime( &clock.tv_sec ); 110 (void)sprintf(line_buf[i], " "); 111 sizes[i] = strlen(line_buf[i]); 112 max_size = max(max_size, sizes[i]); 113 i++; 114 (void)sprintf(line_buf[i], "Message from Talk_Daemon@%s at %d:%02d ...", 115 hostname, localclock->tm_hour , localclock->tm_min ); 116 sizes[i] = strlen(line_buf[i]); 117 max_size = max(max_size, sizes[i]); 118 i++; 119 (void)sprintf(line_buf[i], "talk: connection requested by %s@%s", 120 request->l_name, remote_machine); 121 sizes[i] = strlen(line_buf[i]); 122 max_size = max(max_size, sizes[i]); 123 i++; 124 (void)sprintf(line_buf[i], "talk: respond with: talk %s@%s", 125 request->l_name, remote_machine); 126 sizes[i] = strlen(line_buf[i]); 127 max_size = max(max_size, sizes[i]); 128 i++; 129 (void)sprintf(line_buf[i], " "); 130 sizes[i] = strlen(line_buf[i]); 131 max_size = max(max_size, sizes[i]); 132 i++; 133 bptr = big_buf; 134 *bptr++ = '\007'; /* send something to wake them up */ 135 *bptr++ = '\r'; /* add a \r in case of raw mode */ 136 *bptr++ = '\n'; 137 for (i = 0; i < N_LINES; i++) { 138 /* copy the line into the big buffer */ 139 lptr = line_buf[i]; 140 while (*lptr != '\0') 141 *(bptr++) = *(lptr++); 142 /* pad out the rest of the lines with blanks */ 143 for (j = sizes[i]; j < max_size + 2; j++) 144 *(bptr++) = ' '; 145 *(bptr++) = '\r'; /* add a \r in case of raw mode */ 146 *(bptr++) = '\n'; 147 } 148 *bptr = '\0'; 149 iovec.iov_base = big_buf; 150 iovec.iov_len = bptr - big_buf; 151 /* 152 * we choose a timeout of RING_WAIT-5 seconds so that we don't 153 * stack up processes trying to write messages to a tty 154 * that is permanently blocked. 155 */ 156 if (ttymsg(&iovec, 1, tty, RING_WAIT - 5) != NULL) 157 return (FAILED); 158 159 return (SUCCESS); 160 } 161