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 "$FreeBSD$"; 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 #include "ttymsg.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(CTL_MSG *request, const char *remote_machine) 75 { 76 char full_tty[32]; 77 struct stat stbuf; 78 79 (void)snprintf(full_tty, sizeof(full_tty), 80 "%s%s", _PATH_DEV, request->r_tty); 81 if (stat(full_tty, &stbuf) < 0 || (stbuf.st_mode&020) == 0) 82 return (PERMISSION_DENIED); 83 return (print_mesg(request->r_tty, request, remote_machine)); 84 } 85 86 #define max(a,b) ( (a) > (b) ? (a) : (b) ) 87 #define N_LINES 5 88 #define N_CHARS 256 89 90 /* 91 * Build a block of characters containing the message. 92 * It is sent blank filled and in a single block to 93 * try to keep the message in one piece if the recipient 94 * in in vi at the time 95 */ 96 int 97 print_mesg(const char *tty, CTL_MSG *request, 98 const char *remote_machine) 99 { 100 struct timeval now; 101 time_t clock_sec; 102 struct timezone zone; 103 struct tm *localclock; 104 struct iovec iovec; 105 char line_buf[N_LINES][N_CHARS]; 106 int sizes[N_LINES]; 107 char big_buf[N_LINES*N_CHARS]; 108 char *bptr, *lptr, *vis_user; 109 int i, j, max_size; 110 111 i = 0; 112 max_size = 0; 113 gettimeofday(&now, &zone); 114 clock_sec = now.tv_sec; 115 localclock = localtime(&clock_sec); 116 (void)snprintf(line_buf[i], N_CHARS, " "); 117 sizes[i] = strlen(line_buf[i]); 118 max_size = max(max_size, sizes[i]); 119 i++; 120 (void)snprintf(line_buf[i], N_CHARS, 121 "Message from Talk_Daemon@%s at %d:%02d on %d/%.2d/%.2d ...", 122 hostname, localclock->tm_hour , localclock->tm_min, 123 localclock->tm_year + 1900, localclock->tm_mon + 1, 124 localclock->tm_mday); 125 sizes[i] = strlen(line_buf[i]); 126 max_size = max(max_size, sizes[i]); 127 i++; 128 129 vis_user = malloc(strlen(request->l_name) * 4 + 1); 130 strvis(vis_user, request->l_name, VIS_CSTYLE); 131 (void)snprintf(line_buf[i], N_CHARS, 132 "talk: connection requested by %s@%s", vis_user, remote_machine); 133 sizes[i] = strlen(line_buf[i]); 134 max_size = max(max_size, sizes[i]); 135 i++; 136 (void)snprintf(line_buf[i], N_CHARS, "talk: respond with: talk %s@%s", 137 vis_user, remote_machine); 138 sizes[i] = strlen(line_buf[i]); 139 max_size = max(max_size, sizes[i]); 140 i++; 141 (void)snprintf(line_buf[i], N_CHARS, " "); 142 sizes[i] = strlen(line_buf[i]); 143 max_size = max(max_size, sizes[i]); 144 i++; 145 bptr = big_buf; 146 *bptr++ = '\007'; /* send something to wake them up */ 147 *bptr++ = '\r'; /* add a \r in case of raw mode */ 148 *bptr++ = '\n'; 149 for (i = 0; i < N_LINES; i++) { 150 /* copy the line into the big buffer */ 151 lptr = line_buf[i]; 152 while (*lptr != '\0') 153 *(bptr++) = *(lptr++); 154 /* pad out the rest of the lines with blanks */ 155 for (j = sizes[i]; j < max_size + 2; j++) 156 *(bptr++) = ' '; 157 *(bptr++) = '\r'; /* add a \r in case of raw mode */ 158 *(bptr++) = '\n'; 159 } 160 *bptr = '\0'; 161 iovec.iov_base = big_buf; 162 iovec.iov_len = bptr - big_buf; 163 /* 164 * we choose a timeout of RING_WAIT-5 seconds so that we don't 165 * stack up processes trying to write messages to a tty 166 * that is permanently blocked. 167 */ 168 if (ttymsg(&iovec, 1, tty, RING_WAIT - 5) != NULL) 169 return (FAILED); 170 171 return (SUCCESS); 172 } 173