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
|
/* $OpenBSD: rwall.c,v 1.9 2003/07/02 00:21:16 avsm Exp $ */
/*
* Copyright (c) 1993 Christopher G. Demetriou
* Copyright (c) 1988, 1990 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.
*/
#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1988 Regents of the University of California.\n\
All rights reserved.\n";
#endif /* not lint */
#ifndef lint
/*static char sccsid[] = "from: @(#)wall.c 5.14 (Berkeley) 3/2/91";*/
static char rcsid[] = "$OpenBSD: rwall.c,v 1.9 2003/07/02 00:21:16 avsm Exp $";
#endif /* not lint */
/*
* This program is not related to David Wall, whose Stanford Ph.D. thesis
* is entitled "Mechanisms for Broadcast and Selective Broadcast".
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <sys/param.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <pwd.h>
#include <unistd.h>
#include <paths.h>
#include <rpc/rpc.h>
#include <rpcsvc/rwall.h>
struct timeval timeout = { 25, 0 };
int mbufsize;
char *mbuf;
void makemsg ();
int
main(int argc, char *argv[])
{
char *wallhost, res;
CLIENT *cl;
if ((argc < 2) || (argc > 3)) {
fprintf(stderr, "usage: %s hostname [file]\n", argv[0]);
exit(1);
}
wallhost = argv[1];
makemsg(argv[2]);
/*
* Create client "handle" used for calling MESSAGEPROG on the
* server designated on the command line. We tell the rpc package
* to use the "tcp" protocol when contacting the server.
*/
cl = clnt_create(wallhost, WALLPROG, WALLVERS, "udp");
if (cl == NULL) {
/*
* Couldn't establish connection with server.
* Print error message and die.
*/
clnt_pcreateerror(wallhost);
exit(1);
}
if (clnt_call(cl, WALLPROC_WALL, xdr_wrapstring, &mbuf, xdr_void, &res, timeout) != RPC_SUCCESS) {
/*
* An error occurred while calling the server.
* Print error message and die.
*/
clnt_perror(cl, wallhost);
exit(1);
}
exit(0);
}
void
makemsg(char *fname)
{
struct tm *lt;
struct passwd *pw;
struct stat sbuf;
time_t now;
FILE *fp;
int fd;
char *whom, hostname[MAXHOSTNAMELEN], lbuf[100], tmpname[MAXPATHLEN];
snprintf(tmpname, sizeof(tmpname), "%s/wall.XXXXXXXXXX", _PATH_TMP);
if ((fd = mkstemp(tmpname)) == -1 || !(fp = fdopen(fd, "r+"))) {
(void)fprintf(stderr, "wall: can't open temporary file.\n");
exit(1);
}
(void)unlink(tmpname);
if (!(whom = getlogin()))
whom = (pw = getpwuid(getuid())) ? pw->pw_name : "???";
(void)gethostname(hostname, sizeof(hostname));
(void)time(&now);
lt = localtime(&now);
/*
* all this stuff is to blank out a square for the message;
* we wrap message lines at column 79, not 80, because some
* terminals wrap after 79, some do not, and we can't tell.
* Which means that we may leave a non-blank character
* in column 80, but that can't be helped.
*/
(void)fprintf(fp, "Remote Broadcast Message from %s@%s\n",
whom, hostname);
(void)fprintf(fp, " (%s) at %d:%02d ...\n", ttyname(2),
lt->tm_hour, lt->tm_min);
putc('\n', fp);
if (fname && !(freopen(fname, "r", stdin))) {
(void)fprintf(stderr, "wall: can't read %s.\n", fname);
exit(1);
}
while (fgets(lbuf, sizeof(lbuf), stdin))
fputs(lbuf, fp);
rewind(fp);
if (fstat(fd, &sbuf)) {
(void)fprintf(stderr, "wall: can't stat temporary file.\n");
exit(1);
}
mbufsize = sbuf.st_size;
if (!(mbuf = malloc((u_int)mbufsize))) {
(void)fprintf(stderr, "wall: out of memory.\n");
exit(1);
}
if (fread(mbuf, sizeof(*mbuf), mbufsize, fp) != mbufsize) {
(void)fprintf(stderr, "wall: can't read temporary file.\n");
exit(1);
}
(void)close(fd);
}
|
