1 /* $OpenBSD: announce.c,v 1.26 2024/04/28 16:42:53 florian 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 #include <sys/stat.h> 33 #include <protocols/talkd.h> 34 35 #include <limits.h> 36 #include <paths.h> 37 #include <stdio.h> 38 #include <string.h> 39 #include <unistd.h> 40 #include <vis.h> 41 42 #include "talkd.h" 43 44 static void print_mesg(FILE *,CTL_MSG *,char *); 45 46 /* 47 * Announce an invitation to talk. If the user is 48 * accepting messages, announce that a talk is requested. 49 */ 50 int 51 announce(CTL_MSG *request, char *remote_machine) 52 { 53 char full_tty[PATH_MAX]; 54 FILE *tf; 55 struct stat stbuf; 56 57 (void)snprintf(full_tty, sizeof(full_tty), "%s/%s", _PATH_DEV, 58 request->r_tty); 59 if (access(full_tty, 0) != 0) 60 return (FAILED); 61 if ((tf = fopen(full_tty, "w")) == NULL) 62 return (PERMISSION_DENIED); 63 if (fstat(fileno(tf), &stbuf) == -1) { 64 fclose(tf); 65 return (PERMISSION_DENIED); 66 } 67 if ((stbuf.st_mode & S_IWGRP) == 0) { 68 fclose(tf); 69 return (PERMISSION_DENIED); 70 } 71 print_mesg(tf, request, remote_machine); 72 fclose(tf); 73 return (SUCCESS); 74 } 75 76 #define max(a,b) ( (a) > (b) ? (a) : (b) ) 77 #define N_LINES 5 78 #define N_CHARS 120 79 80 /* 81 * Build a block of characters containing the message. 82 * It is sent blank filled and in a single block to 83 * try to keep the message in one piece if the recipient 84 * is in vi at the time 85 */ 86 static void 87 print_mesg(FILE *tf, CTL_MSG *request, char *remote_machine) 88 { 89 time_t clocktime; 90 struct tm *localclock; 91 char line_buf[N_LINES][N_CHARS]; 92 int sizes[N_LINES]; 93 char big_buf[(N_LINES + 1) * N_CHARS]; 94 char *bptr, *lptr, vis_user[sizeof(request->l_name) * 4]; 95 int i, j, max_size; 96 97 i = 0; 98 max_size = 0; 99 time(&clocktime); 100 localclock = localtime(&clocktime); 101 (void)snprintf(line_buf[i], N_CHARS, " "); 102 sizes[i] = strlen(line_buf[i]); 103 max_size = max(max_size, sizes[i]); 104 i++; 105 if (localclock) { 106 (void)snprintf(line_buf[i], N_CHARS, 107 "Message from Talk_Daemon@%s at %d:%02d ...", 108 hostname, localclock->tm_hour , localclock->tm_min ); 109 } else { 110 (void)snprintf(line_buf[i], N_CHARS, 111 "Message from Talk_Daemon@%s ...", hostname); 112 } 113 sizes[i] = strlen(line_buf[i]); 114 max_size = max(max_size, sizes[i]); 115 i++; 116 strvis(vis_user, request->l_name, VIS_CSTYLE); 117 (void)snprintf(line_buf[i], N_CHARS, 118 "talk: connection requested by %s@%s.", 119 vis_user, remote_machine); 120 sizes[i] = strlen(line_buf[i]); 121 max_size = max(max_size, sizes[i]); 122 i++; 123 (void)snprintf(line_buf[i], N_CHARS, "talk: respond with: talk %s@%s", 124 vis_user, remote_machine); 125 sizes[i] = strlen(line_buf[i]); 126 max_size = max(max_size, sizes[i]); 127 i++; 128 (void)snprintf(line_buf[i], N_CHARS, " "); 129 sizes[i] = strlen(line_buf[i]); 130 max_size = max(max_size, sizes[i]); 131 i++; 132 bptr = big_buf; 133 *bptr++ = '\007'; /* send something to wake them up */ 134 *bptr++ = '\r'; /* add a \r in case of raw mode */ 135 *bptr++ = '\n'; 136 for (i = 0; i < N_LINES; i++) { 137 /* copy the line into the big buffer */ 138 lptr = line_buf[i]; 139 while (*lptr != '\0') 140 *(bptr++) = *(lptr++); 141 /* pad out the rest of the lines with blanks */ 142 for (j = sizes[i]; j < max_size + 2; j++) 143 *(bptr++) = ' '; 144 *(bptr++) = '\r'; /* add a \r in case of raw mode */ 145 *(bptr++) = '\n'; 146 } 147 *bptr = '\0'; 148 fprintf(tf, "%s", big_buf); 149 fflush(tf); 150 } 151