1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1983, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #ifndef lint 33 #if 0 34 static char sccsid[] = "@(#)announce.c 8.3 (Berkeley) 4/28/95"; 35 #endif 36 static const char rcsid[] = 37 "$FreeBSD$"; 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 #include "ttymsg.h" 59 #include "extern.h" 60 61 /* 62 * Announce an invitation to talk. 63 */ 64 65 /* 66 * See if the user is accepting messages. If so, announce that 67 * a talk is requested. 68 */ 69 int 70 announce(CTL_MSG *request, const char *remote_machine) 71 { 72 char full_tty[32]; 73 struct stat stbuf; 74 75 (void)snprintf(full_tty, sizeof(full_tty), 76 "%s%s", _PATH_DEV, request->r_tty); 77 if (stat(full_tty, &stbuf) < 0 || (stbuf.st_mode&020) == 0) 78 return (PERMISSION_DENIED); 79 return (print_mesg(request->r_tty, request, remote_machine)); 80 } 81 82 #define max(a,b) ( (a) > (b) ? (a) : (b) ) 83 #define N_LINES 5 84 #define N_CHARS 256 85 86 /* 87 * Build a block of characters containing the message. 88 * It is sent blank filled and in a single block to 89 * try to keep the message in one piece if the recipient 90 * in vi at the time 91 */ 92 int 93 print_mesg(const char *tty, CTL_MSG *request, 94 const char *remote_machine) 95 { 96 struct timeval now; 97 time_t clock_sec; 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, *vis_user; 104 int i, j, max_size; 105 106 i = 0; 107 max_size = 0; 108 gettimeofday(&now, NULL); 109 clock_sec = now.tv_sec; 110 localclock = localtime(&clock_sec); 111 (void)snprintf(line_buf[i], N_CHARS, " "); 112 sizes[i] = strlen(line_buf[i]); 113 max_size = max(max_size, sizes[i]); 114 i++; 115 (void)snprintf(line_buf[i], N_CHARS, 116 "Message from Talk_Daemon@%s at %d:%02d on %d/%.2d/%.2d ...", 117 hostname, localclock->tm_hour , localclock->tm_min, 118 localclock->tm_year + 1900, localclock->tm_mon + 1, 119 localclock->tm_mday); 120 sizes[i] = strlen(line_buf[i]); 121 max_size = max(max_size, sizes[i]); 122 i++; 123 124 vis_user = malloc(strlen(request->l_name) * 4 + 1); 125 strvis(vis_user, request->l_name, VIS_CSTYLE); 126 (void)snprintf(line_buf[i], N_CHARS, 127 "talk: connection requested by %s@%s", vis_user, remote_machine); 128 sizes[i] = strlen(line_buf[i]); 129 max_size = max(max_size, sizes[i]); 130 i++; 131 (void)snprintf(line_buf[i], N_CHARS, "talk: respond with: talk %s@%s", 132 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, " "); 137 sizes[i] = strlen(line_buf[i]); 138 max_size = max(max_size, sizes[i]); 139 i++; 140 bptr = big_buf; 141 *bptr++ = '\007'; /* send something to wake them up */ 142 *bptr++ = '\r'; /* add a \r in case of raw mode */ 143 *bptr++ = '\n'; 144 for (i = 0; i < N_LINES; i++) { 145 /* copy the line into the big buffer */ 146 lptr = line_buf[i]; 147 while (*lptr != '\0') 148 *(bptr++) = *(lptr++); 149 /* pad out the rest of the lines with blanks */ 150 for (j = sizes[i]; j < max_size + 2; j++) 151 *(bptr++) = ' '; 152 *(bptr++) = '\r'; /* add a \r in case of raw mode */ 153 *(bptr++) = '\n'; 154 } 155 *bptr = '\0'; 156 iovec.iov_base = big_buf; 157 iovec.iov_len = bptr - big_buf; 158 /* 159 * we choose a timeout of RING_WAIT-5 seconds so that we don't 160 * stack up processes trying to write messages to a tty 161 * that is permanently blocked. 162 */ 163 if (ttymsg(&iovec, 1, tty, RING_WAIT - 5) != NULL) 164 return (FAILED); 165 166 return (SUCCESS); 167 } 168