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 34 #ifndef lint 35 static char sccsid[] = "@(#)announce.c 8.2 (Berkeley) 1/7/94"; 36 #endif /* not lint */ 37 38 #include <sys/types.h> 39 #include <sys/uio.h> 40 #include <sys/stat.h> 41 #include <sys/time.h> 42 #include <sys/wait.h> 43 #include <sys/socket.h> 44 #include <protocols/talkd.h> 45 #include <errno.h> 46 #include <syslog.h> 47 #include <unistd.h> 48 #include <stdio.h> 49 #include <string.h> 50 #include <paths.h> 51 52 extern char hostname[]; 53 54 /* 55 * Announce an invitation to talk. 56 */ 57 58 /* 59 * See if the user is accepting messages. If so, announce that 60 * a talk is requested. 61 */ 62 announce(request, remote_machine) 63 CTL_MSG *request; 64 char *remote_machine; 65 { 66 char full_tty[32]; 67 FILE *tf; 68 struct stat stbuf; 69 70 (void)snprintf(full_tty, sizeof(full_tty), 71 "%s%s", _PATH_DEV, request->r_tty); 72 if (stat(full_tty, &stbuf) < 0 || (stbuf.st_mode&020) == 0) 73 return (PERMISSION_DENIED); 74 return (print_mesg(request->r_tty, tf, request, remote_machine)); 75 } 76 77 #define max(a,b) ( (a) > (b) ? (a) : (b) ) 78 #define N_LINES 5 79 #define N_CHARS 120 80 81 /* 82 * Build a block of characters containing the message. 83 * It is sent blank filled and in a single block to 84 * try to keep the message in one piece if the recipient 85 * in in vi at the time 86 */ 87 print_mesg(tty, tf, request, remote_machine) 88 char *tty; 89 FILE *tf; 90 CTL_MSG *request; 91 char *remote_machine; 92 { 93 struct timeval clock; 94 struct timezone zone; 95 struct tm *localtime(); 96 struct tm *localclock; 97 struct iovec iovec; 98 char line_buf[N_LINES][N_CHARS]; 99 int sizes[N_LINES]; 100 char big_buf[N_LINES*N_CHARS]; 101 char *bptr, *lptr, *ttymsg(); 102 int i, j, max_size; 103 104 i = 0; 105 max_size = 0; 106 gettimeofday(&clock, &zone); 107 localclock = localtime( &clock.tv_sec ); 108 (void)sprintf(line_buf[i], " "); 109 sizes[i] = strlen(line_buf[i]); 110 max_size = max(max_size, sizes[i]); 111 i++; 112 (void)sprintf(line_buf[i], "Message from Talk_Daemon@%s at %d:%02d ...", 113 hostname, localclock->tm_hour , localclock->tm_min ); 114 sizes[i] = strlen(line_buf[i]); 115 max_size = max(max_size, sizes[i]); 116 i++; 117 (void)sprintf(line_buf[i], "talk: connection requested by %s@%s", 118 request->l_name, remote_machine); 119 sizes[i] = strlen(line_buf[i]); 120 max_size = max(max_size, sizes[i]); 121 i++; 122 (void)sprintf(line_buf[i], "talk: respond with: talk %s@%s", 123 request->l_name, remote_machine); 124 sizes[i] = strlen(line_buf[i]); 125 max_size = max(max_size, sizes[i]); 126 i++; 127 (void)sprintf(line_buf[i], " "); 128 sizes[i] = strlen(line_buf[i]); 129 max_size = max(max_size, sizes[i]); 130 i++; 131 bptr = big_buf; 132 *bptr++ = '\007'; /* send something to wake them up */ 133 *bptr++ = '\r'; /* add a \r in case of raw mode */ 134 *bptr++ = '\n'; 135 for (i = 0; i < N_LINES; i++) { 136 /* copy the line into the big buffer */ 137 lptr = line_buf[i]; 138 while (*lptr != '\0') 139 *(bptr++) = *(lptr++); 140 /* pad out the rest of the lines with blanks */ 141 for (j = sizes[i]; j < max_size + 2; j++) 142 *(bptr++) = ' '; 143 *(bptr++) = '\r'; /* add a \r in case of raw mode */ 144 *(bptr++) = '\n'; 145 } 146 *bptr = '\0'; 147 iovec.iov_base = big_buf; 148 iovec.iov_len = bptr - big_buf; 149 /* 150 * we choose a timeout of RING_WAIT-5 seconds so that we don't 151 * stack up processes trying to write messages to a tty 152 * that is permanently blocked. 153 */ 154 if (ttymsg(&iovec, 1, tty, RING_WAIT - 5) != NULL) 155 return (FAILED); 156 157 return (SUCCESS); 158 } 159