1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
|
/*
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. 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.
*/
#ifndef lint
#if 0
static char sccsid[] = "@(#)announce.c 8.3 (Berkeley) 4/28/95";
#endif
static const char rcsid[] =
"$FreeBSD$";
#endif /* not lint */
#include <sys/types.h>
#include <sys/uio.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/wait.h>
#include <sys/socket.h>
#include <protocols/talkd.h>
#include <errno.h>
#include <paths.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <unistd.h>
#include <vis.h>
#include "ttymsg.h"
#include "extern.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 timezone zone;
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, &zone);
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]);
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);
}
|
