xref: /netbsd/libexec/talkd/announce.c (revision bf9ec67e)
1 /*	$NetBSD: announce.c,v 1.15 2002/03/04 01:40:56 enami Exp $	*/
2 
3 /*
4  * Copyright (c) 1983, 1993
5  *	The Regents of the University of California.  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. All advertising materials mentioning features or use of this software
16  *    must display the following acknowledgement:
17  *	This product includes software developed by the University of
18  *	California, Berkeley and its contributors.
19  * 4. Neither the name of the University nor the names of its contributors
20  *    may be used to endorse or promote products derived from this software
21  *    without specific prior written permission.
22  *
23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33  * SUCH DAMAGE.
34  */
35 
36 #include <sys/cdefs.h>
37 #ifndef lint
38 #if 0
39 static char sccsid[] = "@(#)announce.c	8.3 (Berkeley) 4/28/95";
40 #else
41 __RCSID("$NetBSD: announce.c,v 1.15 2002/03/04 01:40:56 enami Exp $");
42 #endif
43 #endif /* not lint */
44 
45 #include <sys/types.h>
46 #include <sys/uio.h>
47 #include <sys/stat.h>
48 #include <sys/time.h>
49 #include <sys/wait.h>
50 #include <sys/socket.h>
51 #include <protocols/talkd.h>
52 #include <errno.h>
53 #include <syslog.h>
54 #include <unistd.h>
55 #include <stdio.h>
56 #include <stdlib.h>
57 #include <string.h>
58 #include <time.h>
59 #include <vis.h>
60 #include <paths.h>
61 #include <util.h>
62 #include "extern.h"
63 
64 extern char hostname[];
65 
66 /*
67  * Announce an invitation to talk.
68  */
69 
70 /*
71  * See if the user is accepting messages. If so, announce that
72  * a talk is requested.
73  */
74 int
75 announce(request, remote_machine)
76 	CTL_MSG *request;
77 	char *remote_machine;
78 {
79 	char full_tty[32];
80 	struct stat stbuf;
81 
82 	(void)snprintf(full_tty, sizeof(full_tty),
83 	    "%s%s", _PATH_DEV, request->r_tty);
84 	if (stat(full_tty, &stbuf) < 0 || (stbuf.st_mode&S_IWGRP) == 0)
85 		return (PERMISSION_DENIED);
86 	return (print_mesg(request->r_tty, request, remote_machine));
87 }
88 
89 #define max(a, b) ((a) > (b) ? (a) : (b))
90 #define N_LINES 5
91 #define N_CHARS 256
92 
93 /*
94  * Build a block of characters containing the message.
95  * It is sent blank filled and in a single block to
96  * try to keep the message in one piece if the recipient
97  * in in vi at the time
98  */
99 int
100 print_mesg(tty, request, remote_machine)
101 	char *tty;
102 	CTL_MSG *request;
103 	char *remote_machine;
104 {
105 	struct timeval clock;
106 	time_t clocktime;
107 	struct timezone zone;
108 	struct tm *localclock;
109 	struct iovec iovec;
110 	char line_buf[N_LINES][N_CHARS];
111 	int sizes[N_LINES];
112 	char big_buf[(N_LINES + 1) * N_CHARS];
113 	char *bptr, *lptr, *vis_user;
114 	int i, j, max_size;
115 
116 	i = 0;
117 	max_size = 0;
118 	(void)gettimeofday(&clock, &zone);
119 	clocktime = clock.tv_sec;
120 	localclock = localtime(&clocktime);
121 	(void)snprintf(line_buf[i], N_CHARS, " ");
122 	sizes[i] = strlen(line_buf[i]);
123 	max_size = max(max_size, sizes[i]);
124 	i++;
125 
126 	(void)snprintf(line_buf[i], N_CHARS,
127 	    "Message from Talk_Daemon@%s at %d:%02d ...",
128 	    hostname, localclock->tm_hour, localclock->tm_min);
129 	sizes[i] = strlen(line_buf[i]);
130 	max_size = max(max_size, sizes[i]);
131 	i++;
132 	vis_user = (char *)malloc(strlen(request->l_name) * 4 + 1);
133 	strvis(vis_user, request->l_name, VIS_CSTYLE);
134 	(void)snprintf(line_buf[i], N_CHARS,
135 	    "talk: connection requested by %s@%s.", vis_user, remote_machine);
136 	sizes[i] = strlen(line_buf[i]);
137 	max_size = max(max_size, sizes[i]);
138 	i++;
139 	(void)snprintf(line_buf[i], N_CHARS,
140 	    "talk: respond with:  talk %s@%s", vis_user, remote_machine);
141 	sizes[i] = strlen(line_buf[i]);
142 	max_size = max(max_size, sizes[i]);
143 	i++;
144 	(void)snprintf(line_buf[i], N_CHARS, " ");
145 	sizes[i] = strlen(line_buf[i]);
146 	max_size = max(max_size, sizes[i]);
147 	i++;
148 	bptr = big_buf;
149 	*bptr++ = '\a';			/* send something to wake them up */
150 	*bptr++ = '\r';			/* add a \r in case of raw mode */
151 	*bptr++ = '\n';
152 	for (i = 0; i < N_LINES; i++) {
153 		/* copy the line into the big buffer */
154 		lptr = line_buf[i];
155 		while (*lptr != '\0' && lptr < (line_buf[i] + N_CHARS))
156 			*(bptr++) = *(lptr++);
157 		/* pad out the rest of the lines with blanks */
158 		for (j = sizes[i]; j < max_size + 2; j++)
159 			*(bptr++) = ' ';
160 		*(bptr++) = '\r';	/* add a \r in case of raw mode */
161 		*(bptr++) = '\n';
162 	}
163 	*bptr = '\0';
164 	iovec.iov_base = big_buf;
165 	iovec.iov_len = bptr - big_buf;
166 	/*
167 	 * we choose a timeout of RING_WAIT-5 seconds so that we don't
168 	 * stack up processes trying to write messages to a tty
169 	 * that is permanently blocked.
170 	 */
171 	if (ttymsg(&iovec, 1, tty, RING_WAIT - 5) != NULL)
172 		return (FAILED);
173 
174 	return (SUCCESS);
175 }
176