1 /* $OpenBSD: announce.c,v 1.20 2004/03/10 04:32:45 deraadt Exp $ */ 2 3 /* 4 * Copyright (c) 1983 Regents of the University of California. 5 * 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 /*static char sccsid[] = "from: @(#)announce.c 5.9 (Berkeley) 2/26/91";*/ 34 static char rcsid[] = "$Id: announce.c,v 1.20 2004/03/10 04:32:45 deraadt Exp $"; 35 #endif /* not lint */ 36 37 #include <sys/param.h> 38 #include <sys/types.h> 39 #include <sys/stat.h> 40 #include <sys/time.h> 41 #include <sys/wait.h> 42 #include <sys/socket.h> 43 #include <protocols/talkd.h> 44 #include <errno.h> 45 #include <syslog.h> 46 #include <unistd.h> 47 #include <stdio.h> 48 #include <stdlib.h> 49 #include <string.h> 50 #include <vis.h> 51 #include <paths.h> 52 #include "talkd.h" 53 54 static void print_mesg(FILE *,CTL_MSG *,char *); 55 56 /* 57 * Announce an invitation to talk. If the user is 58 * accepting messages, announce that a talk is requested. 59 */ 60 int 61 announce(CTL_MSG *request, char *remote_machine) 62 { 63 char full_tty[MAXPATHLEN]; 64 FILE *tf; 65 struct stat stbuf; 66 67 (void)snprintf(full_tty, sizeof(full_tty), "%s/%s", _PATH_DEV, 68 request->r_tty); 69 if (access(full_tty, 0) != 0) 70 return (FAILED); 71 if ((tf = fopen(full_tty, "w")) == NULL) 72 return (PERMISSION_DENIED); 73 if (fstat(fileno(tf), &stbuf) < 0) { 74 fclose(tf); 75 return (PERMISSION_DENIED); 76 } 77 if ((stbuf.st_mode & S_IWGRP) == 0) { 78 fclose(tf); 79 return (PERMISSION_DENIED); 80 } 81 print_mesg(tf, request, remote_machine); 82 fclose(tf); 83 return (SUCCESS); 84 } 85 86 #define max(a,b) ( (a) > (b) ? (a) : (b) ) 87 #define N_LINES 5 88 #define N_CHARS 120 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 * is in vi at the time 95 */ 96 static void 97 print_mesg(FILE *tf, CTL_MSG *request, char *remote_machine) 98 { 99 struct timeval clock; 100 time_t clocktime; 101 struct timezone zone; 102 struct tm *localclock; 103 char line_buf[N_LINES][N_CHARS]; 104 int sizes[N_LINES]; 105 char big_buf[(N_LINES + 1) * N_CHARS]; 106 char *bptr, *lptr, vis_user[sizeof(request->l_name) * 4]; 107 int i, j, max_size; 108 109 i = 0; 110 max_size = 0; 111 gettimeofday(&clock, &zone); 112 clocktime = clock.tv_sec; 113 localclock = localtime(&clocktime); 114 (void)snprintf(line_buf[i], N_CHARS, " "); 115 sizes[i] = strlen(line_buf[i]); 116 max_size = max(max_size, sizes[i]); 117 i++; 118 (void)snprintf(line_buf[i], N_CHARS, 119 "Message from Talk_Daemon@%s at %d:%02d ...", 120 hostname, localclock->tm_hour , localclock->tm_min ); 121 sizes[i] = strlen(line_buf[i]); 122 max_size = max(max_size, sizes[i]); 123 i++; 124 strvis(vis_user, request->l_name, VIS_CSTYLE); 125 (void)snprintf(line_buf[i], N_CHARS, 126 "talk: connection requested by %s@%s.", 127 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 fprintf(tf, "%s", big_buf); 157 fflush(tf); 158 } 159