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 #if 0 36 static char sccsid[] = "@(#)announce.c 8.3 (Berkeley) 4/28/95"; 37 #endif 38 static const char rcsid[] = 39 "$Id$"; 40 #endif /* not lint */ 41 42 #include <sys/types.h> 43 #include <sys/uio.h> 44 #include <sys/stat.h> 45 #include <sys/time.h> 46 #include <sys/wait.h> 47 #include <sys/socket.h> 48 49 #include <protocols/talkd.h> 50 51 #include <errno.h> 52 #include <paths.h> 53 #include <stdio.h> 54 #include <stdlib.h> 55 #include <string.h> 56 #include <syslog.h> 57 #include <unistd.h> 58 #include <vis.h> 59 60 extern char hostname[]; 61 62 int print_mesg __P((char *, FILE *, CTL_MSG *, char *)); 63 char *ttymsg __P((struct iovec *, int, char *, int)); 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 FILE *tf; 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&020) == 0) 85 return (PERMISSION_DENIED); 86 return (print_mesg(request->r_tty, tf, 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, tf, request, remote_machine) 101 char *tty; 102 FILE *tf; 103 CTL_MSG *request; 104 char *remote_machine; 105 { 106 struct timeval clock; 107 struct timezone zone; 108 struct tm *localtime(); 109 struct tm *localclock; 110 struct iovec iovec; 111 char line_buf[N_LINES][N_CHARS]; 112 int sizes[N_LINES]; 113 char big_buf[N_LINES*N_CHARS]; 114 char *bptr, *lptr, *vis_user; 115 int i, j, max_size; 116 117 i = 0; 118 max_size = 0; 119 gettimeofday(&clock, &zone); 120 localclock = localtime( &clock.tv_sec ); 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 (void)snprintf(line_buf[i], N_CHARS, 126 "Message from Talk_Daemon@%s at %d:%02d ...", 127 hostname, localclock->tm_hour , localclock->tm_min ); 128 sizes[i] = strlen(line_buf[i]); 129 max_size = max(max_size, sizes[i]); 130 i++; 131 132 vis_user = malloc(strlen(request->l_name) * 4 + 1); 133 strvis(vis_user, request->l_name, VIS_CSTYLE); 134 (void)snprintf(line_buf[i], N_CHARS, 135 "talk: connection requested by %s@%s", vis_user, remote_machine); 136 sizes[i] = strlen(line_buf[i]); 137 max_size = max(max_size, sizes[i]); 138 i++; 139 (void)snprintf(line_buf[i], N_CHARS, "talk: respond with: talk %s@%s", 140 vis_user, remote_machine); 141 sizes[i] = strlen(line_buf[i]); 142 max_size = max(max_size, sizes[i]); 143 i++; 144 (void)snprintf(line_buf[i], N_CHARS, " "); 145 sizes[i] = strlen(line_buf[i]); 146 max_size = max(max_size, sizes[i]); 147 i++; 148 bptr = big_buf; 149 *bptr++ = '\007'; /* send something to wake them up */ 150 *bptr++ = '\r'; /* add a \r in case of raw mode */ 151 *bptr++ = '\n'; 152 for (i = 0; i < N_LINES; i++) { 153 /* copy the line into the big buffer */ 154 lptr = line_buf[i]; 155 while (*lptr != '\0') 156 *(bptr++) = *(lptr++); 157 /* pad out the rest of the lines with blanks */ 158 for (j = sizes[i]; j < max_size + 2; j++) 159 *(bptr++) = ' '; 160 *(bptr++) = '\r'; /* add a \r in case of raw mode */ 161 *(bptr++) = '\n'; 162 } 163 *bptr = '\0'; 164 iovec.iov_base = big_buf; 165 iovec.iov_len = bptr - big_buf; 166 /* 167 * we choose a timeout of RING_WAIT-5 seconds so that we don't 168 * stack up processes trying to write messages to a tty 169 * that is permanently blocked. 170 */ 171 if (ttymsg(&iovec, 1, tty, RING_WAIT - 5) != NULL) 172 return (FAILED); 173 174 return (SUCCESS); 175 } 176