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/* $OpenBSD: announce.c,v 1.24 2016/02/01 07:25:51 mestre Exp $ */ |
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/* |
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* Copyright (c) 1983 Regents of the University of California. |
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* All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* 3. Neither the name of the University nor the names of its contributors |
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* may be used to endorse or promote products derived from this software |
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* without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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* SUCH DAMAGE. |
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*/ |
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#include <sys/stat.h> |
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#include <protocols/talkd.h> |
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#include <limits.h> |
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#include <paths.h> |
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#include <stdio.h> |
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#include <string.h> |
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#include <unistd.h> |
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#include <vis.h> |
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#include "talkd.h" |
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static void print_mesg(FILE *,CTL_MSG *,char *); |
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/* |
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* Announce an invitation to talk. If the user is |
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* accepting messages, announce that a talk is requested. |
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*/ |
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int |
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announce(CTL_MSG *request, char *remote_machine) |
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{ |
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char full_tty[PATH_MAX]; |
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FILE *tf; |
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struct stat stbuf; |
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(void)snprintf(full_tty, sizeof(full_tty), "%s/%s", _PATH_DEV, |
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request->r_tty); |
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if (access(full_tty, 0) != 0) |
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return (FAILED); |
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if ((tf = fopen(full_tty, "w")) == NULL) |
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return (PERMISSION_DENIED); |
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if (fstat(fileno(tf), &stbuf) < 0) { |
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fclose(tf); |
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return (PERMISSION_DENIED); |
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} |
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if ((stbuf.st_mode & S_IWGRP) == 0) { |
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fclose(tf); |
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return (PERMISSION_DENIED); |
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} |
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print_mesg(tf, request, remote_machine); |
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fclose(tf); |
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return (SUCCESS); |
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} |
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#define max(a,b) ( (a) > (b) ? (a) : (b) ) |
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#define N_LINES 5 |
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#define N_CHARS 120 |
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/* |
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* Build a block of characters containing the message. |
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* It is sent blank filled and in a single block to |
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* try to keep the message in one piece if the recipient |
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* is in vi at the time |
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*/ |
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static void |
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print_mesg(FILE *tf, CTL_MSG *request, char *remote_machine) |
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{ |
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time_t clocktime; |
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struct tm *localclock; |
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char line_buf[N_LINES][N_CHARS]; |
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int sizes[N_LINES]; |
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char big_buf[(N_LINES + 1) * N_CHARS]; |
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char *bptr, *lptr, vis_user[sizeof(request->l_name) * 4]; |
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int i, j, max_size; |
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i = 0; |
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max_size = 0; |
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time(&clocktime); |
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localclock = localtime(&clocktime); |
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(void)snprintf(line_buf[i], N_CHARS, " "); |
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sizes[i] = strlen(line_buf[i]); |
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max_size = max(max_size, sizes[i]); |
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i++; |
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(void)snprintf(line_buf[i], N_CHARS, |
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"Message from Talk_Daemon@%s at %d:%02d ...", |
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hostname, localclock->tm_hour , localclock->tm_min ); |
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sizes[i] = strlen(line_buf[i]); |
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max_size = max(max_size, sizes[i]); |
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i++; |
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strvis(vis_user, request->l_name, VIS_CSTYLE); |
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(void)snprintf(line_buf[i], N_CHARS, |
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"talk: connection requested by %s@%s.", |
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vis_user, remote_machine); |
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sizes[i] = strlen(line_buf[i]); |
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max_size = max(max_size, sizes[i]); |
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i++; |
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(void)snprintf(line_buf[i], N_CHARS, "talk: respond with: talk %s@%s", |
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vis_user, remote_machine); |
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sizes[i] = strlen(line_buf[i]); |
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max_size = max(max_size, sizes[i]); |
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i++; |
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(void)snprintf(line_buf[i], N_CHARS, " "); |
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sizes[i] = strlen(line_buf[i]); |
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max_size = max(max_size, sizes[i]); |
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i++; |
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bptr = big_buf; |
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*bptr++ = '\007'; /* send something to wake them up */ |
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*bptr++ = '\r'; /* add a \r in case of raw mode */ |
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*bptr++ = '\n'; |
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for (i = 0; i < N_LINES; i++) { |
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/* copy the line into the big buffer */ |
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lptr = line_buf[i]; |
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while (*lptr != '\0') |
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*(bptr++) = *(lptr++); |
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/* pad out the rest of the lines with blanks */ |
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for (j = sizes[i]; j < max_size + 2; j++) |
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*(bptr++) = ' '; |
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*(bptr++) = '\r'; /* add a \r in case of raw mode */ |
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*(bptr++) = '\n'; |
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} |
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*bptr = '\0'; |
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fprintf(tf, "%s", big_buf); |
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fflush(tf); |
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} |