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. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #ifndef lint 31 #if 0 32 static char sccsid[] = "@(#)announce.c 8.3 (Berkeley) 4/28/95"; 33 #endif 34 static const char rcsid[] = 35 "$FreeBSD$"; 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 45 #include <protocols/talkd.h> 46 47 #include <errno.h> 48 #include <paths.h> 49 #include <stdio.h> 50 #include <stdlib.h> 51 #include <string.h> 52 #include <syslog.h> 53 #include <unistd.h> 54 #include <vis.h> 55 56 #include "ttymsg.h" 57 #include "extern.h" 58 59 /* 60 * Announce an invitation to talk. 61 */ 62 63 /* 64 * See if the user is accepting messages. If so, announce that 65 * a talk is requested. 66 */ 67 int 68 announce(CTL_MSG *request, const char *remote_machine) 69 { 70 char full_tty[32]; 71 struct stat stbuf; 72 73 (void)snprintf(full_tty, sizeof(full_tty), 74 "%s%s", _PATH_DEV, request->r_tty); 75 if (stat(full_tty, &stbuf) < 0 || (stbuf.st_mode&020) == 0) 76 return (PERMISSION_DENIED); 77 return (print_mesg(request->r_tty, request, remote_machine)); 78 } 79 80 #define max(a,b) ( (a) > (b) ? (a) : (b) ) 81 #define N_LINES 5 82 #define N_CHARS 256 83 84 /* 85 * Build a block of characters containing the message. 86 * It is sent blank filled and in a single block to 87 * try to keep the message in one piece if the recipient 88 * in vi at the time 89 */ 90 int 91 print_mesg(const char *tty, CTL_MSG *request, 92 const char *remote_machine) 93 { 94 struct timeval now; 95 time_t clock_sec; 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, *vis_user; 102 int i, j, max_size; 103 104 i = 0; 105 max_size = 0; 106 gettimeofday(&now, NULL); 107 clock_sec = now.tv_sec; 108 localclock = localtime(&clock_sec); 109 (void)snprintf(line_buf[i], N_CHARS, " "); 110 sizes[i] = strlen(line_buf[i]); 111 max_size = max(max_size, sizes[i]); 112 i++; 113 (void)snprintf(line_buf[i], N_CHARS, 114 "Message from Talk_Daemon@%s at %d:%02d on %d/%.2d/%.2d ...", 115 hostname, localclock->tm_hour , localclock->tm_min, 116 localclock->tm_year + 1900, localclock->tm_mon + 1, 117 localclock->tm_mday); 118 sizes[i] = strlen(line_buf[i]); 119 max_size = max(max_size, sizes[i]); 120 i++; 121 122 vis_user = malloc(strlen(request->l_name) * 4 + 1); 123 strvis(vis_user, request->l_name, VIS_CSTYLE); 124 (void)snprintf(line_buf[i], N_CHARS, 125 "talk: connection requested by %s@%s", vis_user, remote_machine); 126 sizes[i] = strlen(line_buf[i]); 127 max_size = max(max_size, sizes[i]); 128 i++; 129 (void)snprintf(line_buf[i], N_CHARS, "talk: respond with: talk %s@%s", 130 vis_user, remote_machine); 131 sizes[i] = strlen(line_buf[i]); 132 max_size = max(max_size, sizes[i]); 133 i++; 134 (void)snprintf(line_buf[i], N_CHARS, " "); 135 sizes[i] = strlen(line_buf[i]); 136 max_size = max(max_size, sizes[i]); 137 i++; 138 bptr = big_buf; 139 *bptr++ = '\007'; /* send something to wake them up */ 140 *bptr++ = '\r'; /* add a \r in case of raw mode */ 141 *bptr++ = '\n'; 142 for (i = 0; i < N_LINES; i++) { 143 /* copy the line into the big buffer */ 144 lptr = line_buf[i]; 145 while (*lptr != '\0') 146 *(bptr++) = *(lptr++); 147 /* pad out the rest of the lines with blanks */ 148 for (j = sizes[i]; j < max_size + 2; j++) 149 *(bptr++) = ' '; 150 *(bptr++) = '\r'; /* add a \r in case of raw mode */ 151 *(bptr++) = '\n'; 152 } 153 *bptr = '\0'; 154 iovec.iov_base = big_buf; 155 iovec.iov_len = bptr - big_buf; 156 /* 157 * we choose a timeout of RING_WAIT-5 seconds so that we don't 158 * stack up processes trying to write messages to a tty 159 * that is permanently blocked. 160 */ 161 if (ttymsg(&iovec, 1, tty, RING_WAIT - 5) != NULL) 162 return (FAILED); 163 164 return (SUCCESS); 165 } 166