/* * Copyright (c) 1983, 1993 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)announce.c 8.3 (Berkeley) 4/28/95 * $FreeBSD: src/libexec/talkd/announce.c,v 1.11.2.3 2001/10/18 12:30:42 des Exp $ */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "extern.h" #include "ttymsg.h" extern char hostname[]; /* * Announce an invitation to talk. */ /* * See if the user is accepting messages. If so, announce that * a talk is requested. */ int announce(CTL_MSG *request, const char *remote_machine) { char full_tty[32]; struct stat stbuf; (void)snprintf(full_tty, sizeof(full_tty), "%s%s", _PATH_DEV, request->r_tty); if (stat(full_tty, &stbuf) < 0 || (stbuf.st_mode&020) == 0) return (PERMISSION_DENIED); return (print_mesg(request->r_tty, request, remote_machine)); } #define max(a,b) ( (a) > (b) ? (a) : (b) ) #define N_LINES 5 #define N_CHARS 256 /* * Build a block of characters containing the message. * It is sent blank filled and in a single block to * try to keep the message in one piece if the recipient * in vi at the time */ int print_mesg(const char *tty, CTL_MSG *request, const char *remote_machine) { struct timeval now; time_t clock_sec; struct tm *localclock; struct iovec iovec; char line_buf[N_LINES][N_CHARS]; int sizes[N_LINES]; char big_buf[N_LINES*N_CHARS]; char *bptr, *lptr, *vis_user; int i, j, max_size; i = 0; max_size = 0; gettimeofday(&now, NULL); clock_sec = now.tv_sec; localclock = localtime(&clock_sec); (void)snprintf(line_buf[i], N_CHARS, " "); sizes[i] = strlen(line_buf[i]); max_size = max(max_size, sizes[i]); i++; (void)snprintf(line_buf[i], N_CHARS, "Message from Talk_Daemon@%s at %d:%02d on %d/%.2d/%.2d ...", hostname, localclock->tm_hour , localclock->tm_min, localclock->tm_year + 1900, localclock->tm_mon + 1, localclock->tm_mday); sizes[i] = strlen(line_buf[i]); max_size = max(max_size, sizes[i]); i++; vis_user = malloc(strlen(request->l_name) * 4 + 1); strvis(vis_user, request->l_name, VIS_CSTYLE); (void)snprintf(line_buf[i], N_CHARS, "talk: connection requested by %s@%s", vis_user, remote_machine); sizes[i] = strlen(line_buf[i]); max_size = max(max_size, sizes[i]); i++; (void)snprintf(line_buf[i], N_CHARS, "talk: respond with: talk %s@%s", vis_user, remote_machine); sizes[i] = strlen(line_buf[i]); max_size = max(max_size, sizes[i]); i++; (void)snprintf(line_buf[i], N_CHARS, " "); sizes[i] = strlen(line_buf[i]); max_size = max(max_size, sizes[i]); bptr = big_buf; *bptr++ = '\007'; /* send something to wake them up */ *bptr++ = '\r'; /* add a \r in case of raw mode */ *bptr++ = '\n'; for (i = 0; i < N_LINES; i++) { /* copy the line into the big buffer */ lptr = line_buf[i]; while (*lptr != '\0') *(bptr++) = *(lptr++); /* pad out the rest of the lines with blanks */ for (j = sizes[i]; j < max_size + 2; j++) *(bptr++) = ' '; *(bptr++) = '\r'; /* add a \r in case of raw mode */ *(bptr++) = '\n'; } *bptr = '\0'; iovec.iov_base = big_buf; iovec.iov_len = bptr - big_buf; /* * we choose a timeout of RING_WAIT-5 seconds so that we don't * stack up processes trying to write messages to a tty * that is permanently blocked. */ if (ttymsg(&iovec, 1, tty, RING_WAIT - 5) != NULL) return (FAILED); return (SUCCESS); }