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 8.3 (Berkeley) 4/28/95"; 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 47 #include <protocols/talkd.h> 48 49 #include <errno.h> 50 #include <paths.h> 51 #include <stdio.h> 52 #include <stdlib.h> 53 #include <string.h> 54 #include <syslog.h> 55 #include <unistd.h> 56 #include <vis.h> 57 58 extern char hostname[]; 59 60 /* 61 * Announce an invitation to talk. 62 */ 63 64 /* 65 * See if the user is accepting messages. If so, announce that 66 * a talk is requested. 67 */ 68 announce(request, remote_machine) 69 CTL_MSG *request; 70 char *remote_machine; 71 { 72 char full_tty[32]; 73 FILE *tf; 74 struct stat stbuf; 75 76 (void)snprintf(full_tty, sizeof(full_tty), 77 "%s%s", _PATH_DEV, request->r_tty); 78 if (stat(full_tty, &stbuf) < 0 || (stbuf.st_mode&020) == 0) 79 return (PERMISSION_DENIED); 80 return (print_mesg(request->r_tty, tf, request, remote_machine)); 81 } 82 83 #define max(a,b) ( (a) > (b) ? (a) : (b) ) 84 #define N_LINES 5 85 #define N_CHARS 256 86 87 /* 88 * Build a block of characters containing the message. 89 * It is sent blank filled and in a single block to 90 * try to keep the message in one piece if the recipient 91 * in in vi at the time 92 */ 93 print_mesg(tty, tf, request, remote_machine) 94 char *tty; 95 FILE *tf; 96 CTL_MSG *request; 97 char *remote_machine; 98 { 99 struct timeval clock; 100 struct timezone zone; 101 struct tm *localtime(); 102 struct tm *localclock; 103 struct iovec iovec; 104 char line_buf[N_LINES][N_CHARS]; 105 int sizes[N_LINES]; 106 char big_buf[N_LINES*N_CHARS]; 107 char *bptr, *lptr, *vis_user; 108 int i, j, max_size; 109 110 i = 0; 111 max_size = 0; 112 gettimeofday(&clock, &zone); 113 localclock = localtime( &clock.tv_sec ); 114 (void)snprintf(line_buf[i], N_CHARS, " "); 115 sizes[i] = strlen(line_buf[i]); 116 max_size = max(max_size, sizes[i]); 117 i++; 118 (void)snprintf(line_buf[i], N_CHARS, 119 "Message from Talk_Daemon@%s at %d:%02d ...", 120 hostname, localclock->tm_hour , localclock->tm_min ); 121 sizes[i] = strlen(line_buf[i]); 122 max_size = max(max_size, sizes[i]); 123 i++; 124 125 vis_user = malloc(strlen(request->l_name) * 4 + 1); 126 strvis(vis_user, request->l_name, VIS_CSTYLE); 127 (void)snprintf(line_buf[i], N_CHARS, 128 "talk: connection requested by %s@%s", vis_user, remote_machine); 129 sizes[i] = strlen(line_buf[i]); 130 max_size = max(max_size, sizes[i]); 131 i++; 132 (void)snprintf(line_buf[i], N_CHARS, "talk: respond with: talk %s@%s", 133 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 sizes[i] = strlen(line_buf[i]); 139 max_size = max(max_size, sizes[i]); 140 i++; 141 bptr = big_buf; 142 *bptr++ = '\007'; /* send something to wake them up */ 143 *bptr++ = '\r'; /* add a \r in case of raw mode */ 144 *bptr++ = '\n'; 145 for (i = 0; i < N_LINES; i++) { 146 /* copy the line into the big buffer */ 147 lptr = line_buf[i]; 148 while (*lptr != '\0') 149 *(bptr++) = *(lptr++); 150 /* pad out the rest of the lines with blanks */ 151 for (j = sizes[i]; j < max_size + 2; j++) 152 *(bptr++) = ' '; 153 *(bptr++) = '\r'; /* add a \r in case of raw mode */ 154 *(bptr++) = '\n'; 155 } 156 *bptr = '\0'; 157 iovec.iov_base = big_buf; 158 iovec.iov_len = bptr - big_buf; 159 /* 160 * we choose a timeout of RING_WAIT-5 seconds so that we don't 161 * stack up processes trying to write messages to a tty 162 * that is permanently blocked. 163 */ 164 if (ttymsg(&iovec, 1, tty, RING_WAIT - 5) != NULL) 165 return (FAILED); 166 167 return (SUCCESS); 168 } 169